Problems with external mod chip

I have an external mod chip, I know it works cause I copied Resident Evil Director's Cut, and Driver 2 and they work fine. I recently tried copying Knockout Kings 2001, Tony Hawk 2, Wu Tang, Ready 2 Rumble Round 2, Both Dukes of Hazzard games, Jedi Powers Battle, and The World is Not Enough. a few of them burn all the way to the end of the CD, others don't. But even with the ones the Burn to the End of the CD won't work with My Mod, Do I need a Stealth Mod or am I doing something wrong? I have a Ricoh 4x4x24 CDR, I use CRDWIN, Easy CD Creator 4.0, Discjuggler, Nero, etc.... Same results. Is it me or my mod or my equipment?