I have the same problem. The same source code for the iPhone and iPad, but the iPad version curls the page too much, leaving a lot of free space. Then I tried to put a shortcut at the bottom of the iPhone version and the same thing would happen.
The explanation . Apparently, UIModalTransitionStylePartialCurl
always closes half the page, at least. The only reason the iPhone does not leave free space, but on the iPad it is because, because the screen is much smaller, on the iPhone your controls usually take up not much less than half the page, which is not the case on the iPad.
The only workaround I found was to redesign the iPad plan, so your user interface controls take up more space or just "live with it."
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