Does the RAM on the MMR not auto-configure? I have 12MB on my A500 and the only reason I've not gone to 18 is is I could never find the higher capacity chips for my VXL-30.
AFAIK your system should be able to support without too much trouble:
8MB 16-bit fast on the side expansion slot
8MB 32-bit fast on the accelerator
2MB chip
All of those things should autoconfigure, or be selectable with not much more than a few jumper changes. Your mileage may vary.

Edit: are you trying to change the mask to get it to transfer directly from the hard drive controller into 32-bit memory? I'm not sure what you're trying to do here. Maybe I need more coffee, lol.
