If an add-on guy at JAX is only getting 65 hours a month, he's not trying.
I had no trouble sustaining 100/month there.
Also, got 90-100 hours/month at ATL when I moved up there.
If you go to a CFI location, there's TONS of hours in training that can be done to finish up the CFI guys, if you're willing to put in the time. I found that there were all too many people that didn't want to work that hard, which left lots of time available for the more motivated.
I'd have to say JAX was far and away the most busy location when I was there and there was definitely TONS of time for the SE guys. ATL and DFW were second, but PHX wasn't a CFI location at that time.
Just my experience, your mileage may vary.