I found one of my 8-liners had a working DBV-30 in it. Upon closer inspection, I noticed the rest of the units had cut pins 1 and 5. For some reason the majority of DBV's (Other manufacturers) seem to work fine w/out these pins connected. As such, I tried the DBV-30's in the machine with a working unit and they all work perfectly.
Pin 1 and 5 are +5v and Ground. The DBV-30's power up and appear to be working 100% w/out these lines connected, but they WILL NOT pull in bills. Connecting them fixed the problem.
Thanks anyway guys, hopefully this helps someone else in the future.
FWIW: My Golden Tee also had these two pins cut. (It was missing the DBV when I purchased it)