I'm watching this build with great interest.
Are you considering going with a bolt-on wing, rather than the rubber band mount? It would be consistent with your beefing up the wing center with the wide fiberglas section and would certainly be nice for hard flying. I once had my Classic fuselage "depart" from the wing in a hard loop. I had forgotten to put on enough rubber bands and paid the price. The wing came down like a fluttering leaf, no damage - but the fuselage didn't do so well.