There's no way FWs shed their wings pulling out of dives, like they do here in AH. They were diving machines, high-speed monsters. They had a solid wing spar almost all the way through the entire wing, and another through half of it. I doubt they'd EVER ripped a wing off in flight, ever (well... unless it was shot off, mind you).
EDIT: I would think that 12 panzerfausts and the rack mounts for them would create a helluva lot more drag, and weight a helluva lot more, than 2 internal MG151/20s with 150 rounds each.