Hi Rocky, First off, Welcome to Amiga.org :-)
Is it older, or newer games you have problems with? Some older games designed to run on Amiga 500 and the like don't play well with the 030 and extra features of your A1200 and CPU Card.
WHDLoad fortunately has some Tooltypes that can get round the problems mostly,
If you select the icon of the game you want to play, go to Icon, then information, and you can add a tooltype, then hit save.
One of the handiest commands is "NOCACHE" (without the quotes) This disables the CPUs caches and helps with a lot of titles I've found.
Which games in particular are you having problems with, I can test them on my A1200 to confirm they work. Whilst I don't have an ACA030 card, I have an older Blizzard - which has the same CPU - All things WHDLoad generally work on the 030.
Robert.