Navigation Bar Flicker with Custom Transition on iPhone 4 and iPad - iphone

I created a custom transition (UIViewControllerAnimatedTransitioning) in iOS7 and all seemed to work well. However, I noticed on iPhone 4 and iPad (when displaying as an iPhone app) that it have a weird flicker bug at the end of the transition. Has anyone else encountered this problem? I'm not sure if it's an iOS bug or a problem with my code.
https://www.youtube.com/watch?v=jl7qzgvfxhI&feature=youtu.be

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Finally, it was just a question of bad storyboard alignment. I was just lucky it was working before!

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This is my first iPhone app (iPhone 5), and it's basically ready to submit to Apple except...
I'm stumped on how to get my app to display on the iPad like it would in compatibility mode if it had a 3.5 inch screen. But it has a 4-inch screen, of course. It's an iPhone 5 app. And Apple has not yet provided a compatibility mode (that I am aware of) that will display the 4-inch screen properly in compatibility mode on the iPad. Instead, compatibility mode distorts and cuts off the 4-inch layout and smushes it into a 3.5-inch compatibility mode box.
I have read all of the stackoverflow Q&A's that I could find, plus many other web pages, tried numerous approaches, but all solutions end up with my iPhone storyboard layout distorted on the iPad and/or nailed to the top left portion of the iPad screen, or both.
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You know how 3.5-inch iphone apps look on the ipad in compatibility mode? That is EXACTLY how I want my iPhone 5, 4-inch screen to look on the iPad, but with the 4-inch dimensions. I do not want the app to occupy nearly all of the iPad screen. Just a box that looks like the iphone 5 app, hanging right there centered in the iPad screen. I don't have a problem with figuring out how to connect things to my view controllers, fwiw.
I don't know how to put this any more specifically. If my question is unclear, perhaps someone could help me to restate it? This is NOT a duplicate of other stackoverflow topics I have been able to find. But I'm willing to be corrected.
Hellllp! :-) Thanks in advance for any light you may be able to shed. I'm hoping to avoid starting from scratch to create a usable iPad presentation for my iPhone 5 app.
iPad doesn't work like that. I believe the reason is that the 2x button would not scale properly for the 4 inch screen.
Either way, you need to make sure your app works well for the 3.5 inch screen anyway, this may be a good time to rethink some of the design of your app to make sure it works well in a 3.5 inch screen.

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