Export to EPUB large image & caption on 1 page

Question

I can't seem to do something that should be very simple. I've spent 2 days on this, checking out Lynda,con courses, and forums. But can't figure it out!
After each chapter, I would like:
1. A full page photo and caption underneath it on same page. It doesn't need to bleed, but I'd like the images to be LARGE, basically take up most of the page (and be centered vertically, if possible, but I can live without that.)
2. The anchored image/caption group should adjust so it takes up roughly the same proportion of the page, if viewed as a single page (e.g when looking at ibooks in portrait position, as it does when looking at it horizontally, meaning it would scale down and look like it takes up most of the page proportionately when page is smaller.)
I grouped the image and caption then anchored them into the text flow. I exported so it would break before the paragraph  the image/caption group anchored to, so  the image DOES start on a new page. But sometimes the caption is with the photo (portrait view) and sometimes on the next page (landscape view). I've tried all kinds of combos with object styles. Can't get it to work. I know it should be simple, since it's a pretty basic design idea.
When viewed horizontally:
For both photo 1 @ 2, the caption is on a new page. On photo 2, the caption is cut off.
When viewed vertically:
For photo 1, the caption is on top of the photo (I thought you couldn't overlap things in Epub3!). For Photo 2, image and caption appear on same page, but image looks small.
The packaged Indesign files are available here
https://dl.dropboxusercontent.com/u/18648953/TestforForum.zip
Thanks!!!

Answer 1

Hi Pooja:
Thanks for your response. I am on CC v.9.2. I took some screenshots from my ipad (I am using the ibooks viewer) to better explain the issue.
Screenshots
1. Test1—photo1: (This is taken from the file in the TestforForum.zip. See link in the original post). This shows roughly how large I want the images to appear. It could be a bit smaller so the caption fits. (Is that why it appears on top of image?)
I didn't take a screenshot, but when you turn ipad landscape, the photo is nice and big, but the caption moves to the next page. I'd like it to scale down proportionately, so the photo and caption are on one page, and fill most of the page.
I did note that these group items are taller than 600 px. So I did another text, making sure the groups were less than 600px high.
2. Test 2—Photo1: (See link below)
The grouped image and caption is 599 px tall. But look how TINY it is on the page now! In landscape mode, it does fill the page, but the caption is cut off.
I uploaded these new files to dropbox, so you can help decipher the exact issue.
https://dl.dropboxusercontent.com/u/18648953/Testforforum2.zip
3. As far as captions getting cut off, I found I needed to make the text frame much taller. I'm guessing this is to accomodate caption fonts becoming bigger when scaled on the reader. BUT if I make the frames taller, that means the photo has to be even smaller, to fit within 600 px height when grouped.
I hope you'll take a look at the two sets of zipped files. I've tried everything I can think of. Please let me know if you need screenshots of the landscape mode.
Thank you!!!! I REALLY appreciate your help on this. Jami