Maybe it's not a wing strength issue, but perhaps different behavior at speed or when it comes out of compression?
I haven't spent a lot of time in the hogs lately, but I know on some planes, if you're compressed you can haul back on the stick as hard as you like and as you slow down, it will gradually come out of the dive without overstressing the wings. Jugs are a good example of this.
Other planes, if you're hauling back on the stick in the same way, when it comes out of compression, there's a distinct 'snap' where it's like the elevator and wings suddenly gain purchase over a period of about a tenth of a second, and WHAM you've pegged the G meter. I believe the 109K4's a good example of this. If you're over a certain speed, when it crosses that threshold, if you don't see it happening and ease off the stick it's real easy to pull the wings off.
Could be something along those lines. Like I say, I haven't spent a lot of time in hogs lately so my memory about the details between models is a bit fuzzy.
Wiley.