I have found that playing a split 4 can effectively stop the wing-t offense. I mean a split 4 not a base 4-4. Put your DT's in 3 techniques and DE's in 7 techniques. Your two inside linebackers should be A -gap players, and your outside linebackers should play four yards deep and four yards outside the DE's. You have effectively taken away the traps and the sweeps, which are the bread and butter of most wing-t offenses.