Hello,
I believe when the batteries are just "sitting there doing nothing", they will be actually discharging the higher amperage batteries to try to make them equal. Don't think you would want to do that. Also when discharging while cart is in operation you will run the lower capacity "zip" which I don't think you would want to do either. Correct, or am I wrong??? I'll think more about it in the morning when I am awake.
Another edit, what's the internal resistance of each?