Hi Jim,
I should have specified that the problem was not that it was a dump valve, but a pull dump where you have to yank on the entire inflator hose to release air from the wing. The lower exhaust valve is just fine.
I dive the same back plate and wing that you do and am planning to replace the pull dump with an elbow and a shorter hose.
It's kind of funny, but I had been diving the rec wing for quite a while before I realized that this was a pull dump and only because someone asked me about it. I've never used it and have always used the lower dump except at surface when I've always used the button on the end of the inflator hose.
If I had it to do over again, I would choose a different wing. When I double up a pair of AL80s, I'm hoping that this is a good wing for those, but we'll see. I've got the pair of AL80s ready to double, but still need to get bands, a manifold and a DIN 1st stage. I'll eventually get another wing for singles.
Christian