Update: I disabled all hacks, and got FitalyStamp to work! The digitizer problems must have been caused by a hack....
FitalyStamp is faster than fitaly, as everyone has pointed out. I got 1 second better than my previous best, and 4 seconds better than my second best. That's after about an hour of practice. FitalyStamp seems slightly larger than Fitaly, so there's a little adaptation.
In my opinion, FitalyStamp is faster than Fitaly because the contrast on the stamp is better than the screen. Also, there's no screen glare. That's my initial impression anyway.