The 1 1/2" front lift by cranked torsion bars is about all you can do. Moving the Tbars will not help as the limit is the bump stops. I removed mine. An adaptor could be designed and made to "lower" the upper ball joints where they press into the upper A frame. This would give you more downwards articulation.

87 Raizer, 4.3V6, Mod TH700R4,231CHD, detroit rear and LSD front, bouncy seats, 2" lift and 32x15 BFG MT tires.