Torsion bars the bigger the better???

My ride has the 1.03 bars, plus HD shocks, plus a 1.125 bar on the front, and it was a DD for 6 years like that, never too stiff.
Yes alloy heads and intake, plus battery relocated to the rear.
But to be fair;
the front runs 235/60-14s on aluminum 7.5s at 29psi, and the rear runs 295/50-15s on aluminum 10s at 24psi. These pressures are what it takes to run the treads flat to the road, for long tread life.

On my unit, I would not be afraid to run a bigger T-bar, but I would want better shocks,lol. And I certainly would not run less; been there done that.