I suggest you try flashing Froyo again with full wipes. I'm not currently running it, but I have a nand of it on my phone, and I specifically remember multi-touch being silky smooth, and Swype being fully functional. The only reason I went back to 2.1 ROMs was that I use the camera a lot, and constantly switching between ROMs splits up my call logs, SMS, and VVMs. I know I can back them up first, but it became a bit of a hassle to take pictures. Other than the cameras, Froyo works great on my phone, plus it's scores almost twice as fast as an overclocked Fresh ROM in the Quadrant benchmarks.