With the profile that I post here, I can play 720p in Nitdroid (I've just raised the voltages, using LV profile, according to 720p maemo post and raised the dsp to 600). The audio lags a bit, but the video is very smooth now
I think that to have 720p smooth in Nitdroid too, we have to integrate the kp49 patches in nitdroid kernel
You can try by yourself by overwriting the files (from Maemo) in /home/etc with these one (remember to cut .txt extension)

EDIT: Thanks to AWasisto for VDD warning, corrected the last profile by disabling VDD1 and VDD2