I have not been having much luck getting any 65C02 to work in my ][+ lately. I know I tried a couple years ago, and seemed to have good initial results. Now nothing seems to work right.
Anyway, if you could do some testing of your ][+ without any CFFA card, just general testing of stuff you would normally do, that would be helpful to see if it is working as expected. Once you have a baseline that always seems to work, then add in the CFFA and see what happens. I think you may find that other stuff doesn't work right with the Rockwell 65C02. At least that has been my experience.
I am interested in anything you find.