racerdx- You might have one of the following problems:
-sidelinks: They could be binding or uneven, and that could cause your problem
-springs: you might have a bad spring, if you havent replaced them recently it cant hurt.
-end points: make sure that you are not combing end points and tweak, since that will defently mess you up.
-bearings: make sure all of your bearings are fine, since that might be the problem or contributing to it
-diff: i dunno if it will do what you are saying, but it could be hurting something, so check that as well
Also you sure you tweaked it properly? You used a flat surface, went very slowly when you raised the car and neither front wheels were binding? (since sometimes if a bearing is bad or the wheelnut is too tight, it can seem like the car is off tweak).
LMK if these suggestions help.