Ok on the first problem, it seems to me that the controls are not being detected fast, like if i want to do very small line or thin lines, i cant ,because if i go down and then left, and then up again, by the time the up movement gets detected, i allready far away, so i cant do like a quick colum.
On the 15khz , yes, is a dedicated setup, i boot like most of us using windows, at 640x480 interlaced i guess they call it? all games work just nice, arcade and emulators, and i did just like you, as soon as i fire up the game, boom, 31 khz , and after i exit the game, i still stucked at 31khz, i need to reboot the pc to get back to 15khz. Ill see if i can post a video, is just my front camera at my cellphone is broken.