Media Encoder File Size Estimates Very Inaccurate (How to Reduce Blu-ray File Size)

Hello there!
I made several wedding videos last summer and exported my video and footage to HD .m2t files using a high profile h.264 codec and they always came out being plenty small to fit on my single layer Blu-ray disks. But this year I filmed a wedding (same camera) but my files seem way larger, so I'm doing something different, and I'm not sure what. Should I use MPEG2?
I'm attaching an image of my Encoder settings. I will say that the files it outputs are playing at the proper rate (in this case, the video rate hovers around 12mb/s like it should). Encoder estimates a file size of 2.7 gb, but the final file is 16.4 gb. That's not very close. This file is full HD, 23.976 fps, 8-bit and about 30 minutes long. I should be able to easily fit this, and the other videos I need on the same disk at these low data rates right? I have some of my Disney Blu-ray movies ripped on my computer and they play at 40 mb/s. That's twice my max rate and those files are 20 gb for an hour of video (including 3 5.1 audio streams, a 7.1 stream and several subtitle tracks, I just have stereo audio).
So should I switch all my files to MPEG2? What are your favorite settings for a putting Canon DSLR h.264 footage on Blu-ray? Thanks!
EDIT: I re-exported using MPEG2 and the file estimates were correct.

Encore, and I suspect most authoring programs, allows a maximum of 40 Mbps COMBINED video and audio. so anything over 35Mbps video only risks problems.
I don't know what all the specific differences are between Adobe Media Encoder/PR/EN's H.264 preset vs the H.264-Bluray, but bitrate going over 35 is one of them. And Encore clearly does not like that. Many encoders result in small (and for some larger) variations that result in spikes over the allowed level. Any of those issues can result in Encore "seeing" a file as not BD legal.
I think all Ann was saying was the she agreed with your using the H.264-BD present with multiplexing off. And she suggested (I thing with the H.264-BD preset) selecting the max bit depth. I'm not sure if she actually meant max bit depth, or max render quality.

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2) because i imagine the above can't be done i was wondering how to go about reducing the size by around 1GB or so, i don't need like 10GB freeing up so it's only a small amount, as said this is a issue i have had with the last few projects i made and the size varies from needing 600MB - 1GB (it doesn't usually exceed needing 1GB free space... besides when i lowered the bit rate which increased size a lot). In the past i always just cut the bitrate of files down a little (never by lots but enough to free space up) but clearly that failed my test so im at a loss of how to reduce file size without a huge loss in quality.
For the record i have already produced the file as both a image file and a folder and both have the same issue.
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It contains 4 Menu's, 13 video files which vary in lengh from short ones at about 5mintues to longer ones which the largest is about 20minutes. I commonly burn this number of video files/space with fine quality and no issue so i would rather not take files from the project.
quality preset details are defaultly as said above set to "1280x720p 50 High quality MPEG-2" settings, i am not on my computer with encore at the moment so i can't post full specifics right now but if you have encore handy you should be able to check.
Tried reducing bit rate but that increased overall size, the actual plan was to hopefully lower the bit rate to around 21 [mbs] (from 25) and then do that for multiple (or all) files until it fitted but after it increased the size i lost hope there, it said the estimated file size (on the individual video) would drop by around 300-400mb but that didn't work.
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one problem i seem to be having when reducing the bitrate is the file size is oddly increasing from 24.8GB to 26.4GB, i can't really figure this one out as well it's having the oppisite effect. I checked the "streams" folder on output and decided to compare automatic transcoding to manual lowered bitrate and im not too sure where the increased file size is going, i found which video file it was causing the issue, all videos files range or average around 1.6GB each but one file was taking 4.5GB, after lowering that files bitrate it cut it down to 2GB which was of course saving me 2GB from the old file but the overall size had increased which was odd. Seems the other files are all the same so it hasn't tried improving them (so it seems) so i can't make ends of why the size is increasing.
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I'm not really the most qualified to answer your question. Since the obsolescence of DVD Studio Pro and the ability to program menus and Steve Jobs saying that BD is a "bag of hurt" and Macs not directly supporting BD, there's been no point for me getting involved with BD creation. Media players (like Roku) will win (IMO.)
Does the disc you made at least play from your Samsung burner?
AVCHD discs are playable on blu-ray players and your final file size is small enough to fit on a regular DVD-r disc. Have you tried just making an AVCHD disc on DVD-r?
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Media Encoder File Size Estimates Very Inaccurate (How to Reduce Blu-ray File Size)

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