¿Are you using the HeadoverHells' Pocket SNES? I get much better results than you at 800 Mhz with transparencies on.
Examples (all with transparencies ON and Advances sound hack ON, using Pocket SNES FAST version and pollux):
Super Mario Kart (E): 34-37FPS
F-Zero (E): 36-38 FPS
Chrono trigger...
I have found this video on GP32Spain and I think that's awesome: http://www.youtube.com/watch?v=q4MO4mtRHHw
Does anyone know if in this video is he/she using the Pocketsnes Hack or the actual version? I will definitely buy a Wiz! :)