help with CvS 2 and SF3 3rd Strike

[cybermonkey]

hi,
i have both of these as japanese versions in cdi format and want to play them on my pal-dreamcast. actually, they are both working fine besides that they only seem to run in 50 hz. i have allready tried the palpatcher but it seems to completely **** up my image of capcom vs. snk 2 and it can't open my street fighter 3 image.
so, has anyone an idea how i could possibly enjoy these games in their full glory on my dreamcast? any kind of help is apreciated.

cu,

cybermonkey