If you want to use ONLY the CSPPC UWSCSI chain, disable the A4KT controller from the CSPPC BootMenu (hit the ESC key during the boot)
goto System, ENABLE MapROM and set the "NCR SCSIPatch" option (this switch, disable the A4KT onboard SCSI).
btw . . . do a:
version cybppc.device FULL
to see wich version of CSPPC FlashUpdate you have currently installed.
Take a look also to the "FlashBios.doc" in this archive
http://grex.amigaworld.de/daten/driver/FlashUpdateCSPPC.lhato know all the options in the CSPPC BootMenu.