I fixed the problem! Turns out the scandoubler
does ignore AGA screenmodes like super72, it was just passing them through to a monitor that can't use them. Though I found some files on Aminet that helped,
super72new.lha had an SVGA super72 driver that worked. Originally, it made the "wrong scan rate, please adjust, as if you could see the friggin screen to do that" message (built into the monitor), so I used another proggy,
MonEd3a.lha, which resulted in 3 hours reminiscant of tuning a uhf station accross the state with an old knob tuner TV set during a thunderstorm, I finally managed to lock in a screen that was @ 791x600 resolution. The 12" 1942 can go up to 800x600, but for 9 pixels lost, I don't have to squint to read my e-mail. (Or use a font thats so big it defeats the purpose of such a resolution) The 20" is nice and crisp, too. Only problem is with alot of 320x200 games, the pixels are square and bigger than some tetris clones I've played. Anyway, heres the settings I used in Moned, in case somebody else comes accross this particular problem.