I will test those out later myself and see if the same thing happens. In the mean time here are a few things you should try. disable stereo. the rs-97 has one speaker, mono is all you're getting anyways. reduce sound quality to 22,050 (or whatever it is in the options). lowering sound quality for mono does not hurt but helps frame rate. set frame skip to 60/1 or auto depending on the game. for lighter games 60/1 worked fine, for heavier games auto was better. Hope this helps.
Hopefully it's not like fba were it seems to work for some and not others. Pocketsnes works like a dream for me now but fba works terrible still.
Edit: kirby 3 runs terrible confirmed. Donkey kong country 3 and contra ran fine with the recommended settings above.