You need to get the lastest SCSI.device on your system. Install BB4 and you will be all set. Or you could track down the latest device and patch it.
BB4 with the newer HD tools will be your best experience. Would recommend that you use PFS from aminet. Be sure to set the masks and max transfers correctly. All the partitions should be the same mask and max transfers.
One Last detail, if you own the WDC 04 SCSI chip, it is known to be buggy. Replace it with th 08 version or the AMD equivalent. They are widely available and cheap.