WWB is rated a 1150 fps with a 115g bullet, that's a pretty light recoiling load. Try running a couple of magazine's worth using a "death" grip on the gun. Yes it's unrealistic and yes your hands will ache after shooting a mag's worth, but it will take out any limp wristing concerns. If you end up with no FTE's then, it's a combination of light recoil, fairly new springs and your grip absorbing some of that weak recoil.

Since your other ammo worked well, it's not purely a gun, magazine or grip issue so long as the ammo you used had enough oomph.