I tend to switch roms and kernels a good bit. Don't know anything about the benchmarks. I used to care about benchmarks, but not anymore.
Prime and Revolver work fine. I'm currently using Prime 1.7 and Netformer kernel 1.6, max overclock of 1.6GHz.
I hear clemsyn-blade rom combo works pretty good, though haven't tried it for an extended period of time.
I've tried pretty much all of the roms/kernels available on XDA, and haven't had any problems with the recent releases.
I don't have tekken 3, most of my games are RPGs and such.
I do have legacy of kain: soul reaver. I hear it is a pretty heavy duty game, so it should give you some decent information
I used these settings:
screen filtering, sharp overlay drawing, print FPS, Enhanced 3D rendering, Mdec Acceleration, Gte Acceleration, Fast Booting, HLE mode
EDIT: I may have also had Spu Sync on, not sure. I usually turn it on, but since the settings rarely save, I don't know.
I also have my transformer overclocked to 1.5GHz, via netformer kernal.
After skipping past the intro, and starting the game, I just ran/jumped around the starting room to see what kind of frame rates I got.
Low:38 (very very rarely, usually 40)
I turned on all of the high-end settings, because that's how I like to play games.
Hope this provides some useful information.
If you want, I'll try some other games at stock/overclocked settings. My play time is very short right now, but next week I'll have plenty of time to play some games.