ALso have had amazing success with Corona servos.... Proven to 318mph on my SC60 and 294mph on my afterburner. Also run them in all my FPV race wings. Not one has failed in over 20 servos.
Id recommend the 919 or 929
To be blunt, its just not worth persisting with. Throw the wing away and use a different one would be the only thing i could recommend and go 60". Narrow the chord, moving the wing to the front of the slot to increase tail moment