No Solder Mod Chip help!!!

[led]

I've installed the no solder mod chip in my v5 PS2 unit. I'm using a GS2 v 2.01 also. I've had success in booting PS2 back up games like wwf smackdown, ssx tricky, and simpsons road rage, using the swap instructions w/o any problems. However, I am having trouble w/ booting up ps one back ups. I'm following the regualr swap instructions for the back up games. It doesn't work for all the ps one games I've tried. Am I the only one having trouble playing some back up ps one games? I can get working so far are tony hawk 3, simpsons wrestling, dragon ball z final bout(u.s version). But having trouble w/ spider-man 2, and spongebob square pants. Now I know these are working back ups because I have tried them on another old chipped playstation one system and they all worked. All these games are backed up using cdrwin and on verbatim cdrs. why can't I get them all to work on my PS2 system? It's driving me crazy. Do I have to boot some of the ps one back up games differently? Any info would be greatly appreciated. Thanks.