I've seen this done several times in the offroading circuit and it seems to be a life saver when you're trying to keep your driveshafts from Coke Can twisting - try ratchet strapping the engine hoists to a strong point on the chassis (hood bolt points, strut tower holes near fender) - go both directions; left and right... Try driving the car under the same conditions and see how that changes things... just don't do this for more that an hour. If things seem to get better I'd stick with looking at your drivetrain and "Nutt'n Bolt'n" the lower front chassis. Loose nuts on a sub frame are nice greeting cards for disaster.

Tim