r0jaws, the "accelerator" is not dead, as you can see (it works flawlessly in "original" mode).
The problem is related with the hack itself (and this board is just a hack).
Put a true accelerator inside the very nice A2000 you have and use the "accelerator" inside an A500 (or A1000).
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For the problem with the RAM: the A2000 Zorro bus can only manage 8Mb. That's why you can't have more than this.
To achieve more fast RAM, you need an accelerator with its own RAM and a better processor.