You should be able to find narrow chain terminators relatively cheaply. You might even be able to find a cable with one built in. I enabled TermPwr on my hard drive because, IIRC, the WarpEngine does not provide it. If it does, no harm done.
Also, if you WarpEngine is the start of the chain, make sure your resistor blocks are installed -- that's your local termination. If it sits somewhere in the middle of the chain, you'll need termination on both ends of the cable.
If you have another SCSI device further down the chain than the hard drive, check it to see if it provides termination. Some devices do, some don't. My Zip drive does not, though my CD-ROM does, as did my Seagate and Western Digital hard drives.
EDIT: Also, some 80-50 and 68-50 adapters provide termination via resistor packs, but need TermPwr from another device.