Glad to hear that you are overcoming the shortcomings and hope it works out well for you. I didn't even open the tube of included glue myself and used 30 minute epoxy on my wings. I just don't trust contact adhesive for that type of connection. With the glass cloth you should still be ok though. Hopefully since yours was not in the best of condition airframe wise you'll have a smooth running fan without having to mess with it.
I've already tested 4-3/4 & 5" CG's for ya so that should save a little time. You might as well start at 5-1/4 as that will be my next move. I think LBJ has already shown us that the 165mm mark is a bit too far back.
BTW I've alnmost completed that JAS39 now.