Game Issues with Nexus 7

[Perrind]

I am using my Nexus 7, which is running Android 4.2.2.

I have several roms including: Final Fantasy Tactics: War of the Lions, Knights in the Nightmare (which is said to be working), Jeanne D'arc, and Ys 6 - The Ark of Napishtim.

None of the above are working properly.

- FFT goes freezes on the Square logo, and does nothing.
- Knights in the Nightmare goes through a few loading bars, then a black screen, and then will kick me off to the home screen.
- Jeanne D'arc immediately gives me a black screen, and then kicks me out of PPSSPP.
- Ys will let me load up the game, start the game, go through about 2 or 3 minutes, then gives me flashing pink and black screens.

I've been anxiously awaiting being able to play these PSP roms, but is there anyone who owns a Nexus 7 who can tell me what games they are able to run? Thanks!