Hi there,
i was usnign a z3 bussboard wiht a Cyberstorm PPC with Scsi ,no problems after i had upgraded the z3 bus board to rev 6,8 the latest one.I remember i had a previous version , and i could not get it working with the Cyberstorm PPC.Micronik had replaced the z3 to the latest rev available at a cost,
it was a hardware prom.Nowadays i use the Cyberstorm with an A4000 and the z3 busboard with a 3640.
Also i bet you already use 3,1 roms.I remember when i had 3,0 roms and although i was using the blizrom program to flash the 3,1 roms into the cyberstorm ,i could not get the busboard work.Upgraded to 3,1 chips and voila...