Mpeg 2 audio much louder than H.264???

Hey all,
For the last year I've been exporting past projects as H.264s and flipping them to mpeg2 TS on my PC. More recently I've been playing around with mpeg2 settings in Compressor to trim a step off the whole process. All the mpeg2 settings I'm using are working great, save for the audio. I set all my ads to -12dB in Final Cut. After I send a spot to Compressor and throw the mpeg2 preset on it, it is noticeably louder than it should be. I watch the .m2t files back with MPEG Streamclip. As a test I exported a .aiff file from streamclip and imported it into Final Cut and it's upwards of 6 dB louder than it should be.
I can't find ANYTHING on the internet about this or how to fix it. What am I missing? Help me, please!

To make sure the Dolby AC3 setting does not alter your audio with normalization or compression, you need to turn off dialog normalization and compression.
a) Click your audio setting and have a look at the Encoder tab in the Inspector window.
b) Under the Audio tab, change the Dialog Normalization from -27 to -31 to disable it.
c) Click the Preprocessing tab and set the Compression Preset to None.
d) Deselect the Low-Pass Filter and DC Filter
Compressor User Manual -> Creating Dolby Digital Professional Output Files
Important: It is critical that you set the Dialog Normalization setting correctly if you intend to use any of the Compression Preset settings. The Compression Preset settings assume that the audio, after the dialogue has been normalized, is at the normal listening level of 31 dBFS. Levels that are consistently louder than that result in distorted sound and erratic levels.
If you do not know the sound level of the source file or for some other reason want to ensure the Dolby Digital Professional encoder does not affect your sound levels, enter –31 for the Dialog Normalization and choose None in the Compression Preset pop-up menu (located in the Preprocessing tab).

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