Originally Posted by
andr0id
Poor man's way of checking the dish is to flip the wheel in the dropouts.
If the rim stays in the same (wrong) place relative to the frame, the frame is bad.
If the rim error moves to the other side, the dish is wrong.
He already did that. See above.
OP, if you don't know how to verify proper spoke tension and don't have a wheel dishing tool, you should stop fooling with the wheel yourself. I am assuming you have it straight in the dropouts, so there is a real problem. Take it to a pro, preferably a wheel builder. If that isn't possible see the best LBS you have available.