So after a little while the charger showed that it had increased the charge to the Optima so I ran the unit on the Centennial battery for a while to charge it real quick. Then I left the
G1100 Genius Charger connected to the Optima for the rest of this weekend. I think it should work out great and we'll install the battery in the customers vehicle and get feedback from them in the future.
The other charger in the shop is an industrial quick charger which doesn't charge batteries nicely at all. It is a quick and dirty charger that isn't meant to recover, condition or anything fancy.