thanks for letting me know!
hmm, sub 30 makes me sad. would you mind sending me your specs? you can send them to zachisagardner@gmail.com.
were the scanline things persistent? did they happen in any specific situations or levels? fullscreen windowed? there's a display option where you can switch turn on integer scaling, does changing that fix anything? even if you could send me a picture/video of it with your phone or something of the problem that would be incredibly helpful.
again, thanks so much for letting me know about the problems.