I have a similar setup working well. The only difference between yours and mine is my card is only CS MK III 060, however I think the SCSI portion is the same.
Make sure you have proper cabling and termination on the CS SCSI side (IE the upper 8 address lines).
I am currently not using the SCSI on the A4000T motherboard so I have A4000D 40.68 roms installed which drastically reduces the boot up time. Also make sure no hard drives with a bootable partition are on the IDE buss. Mine only has a CDRW drive as master currently and that also helps. It seems that 40.70 roms and the A4000T IDE are a less than ideal combination.
Sorry if none of this helps but it's all I can think of at the moment.
