Did you follow the service manual procedures when you re-installed the T-bars?
First remove the upper control arm bumpers. Then jack up the car up with the k-frame. Completely unload the suspension. Un-thread the cam adjusting bolts until only the ball tip is exposed on the top of the block. With the lower control arm hanging as low as it can go, rotate the torsion bar receiver and adjustment arm/cup down against the adjuster bolt ball tip. In that position, the bar's hexes will line up the way they should, grease, and tap into bars into place. Install the C-clips in the torsion bar support. Turn the adjusting bolt in about half way. Don't do any final height adjustment until the wheels are back on the ground with the engine and transmission installed. Also make sure you have the T-bars installed in the proper R and L positions. If you did follow all of this I would say that your T-bars are too weak.