it's just a matter of growing accustomed to it. I play on a 720p projector too. :) it took me some serious getting used to.
Also WipEout will still be in the store, you just can't see it because you've bought it.
I have a fat PSP so I can't try pure or pulse on the jector either, but wipeout, 2097, and especially 3se look great on my wall :D