Once I create a custom timing with powerstrip, I'm having a hard time modifying it, particularly in the case where it's a mode where Windows doesn't display properly. It seems that it wants you to tweak the timings only if you can set the mode and have Windows function properly, which isn't the case for modes like 288x244 for Pacman. I want to tweak the front porch to get it on the screen nicely. If I delete the mode in PowerStrip, reboot, and try to recreate with different parameters, it says something about the driver already having that mode and not letting me create the mode again without switching to that mode for the desktop.