Sway bar with large diameter t-bars?

Okay, good info all around.

I would have guessed that as you increase the rate (diameter) of the T-bars, you wind up with less up and down motion on either side for a given amount of cornering force, making less for the sway bar to do compared to softer springs. If that were true, I'd think you'd want to go with a stiffer sway bar when you have stiffer T-bars. if so, there would be a point at which the springs were heavy enough that the stock sway bar wouldn't be worth bothering with, and you'd need a heavier sway bar to make a difference.

With the thicker t-bars upfront, you can use the sway bar more for
tuning oversteer or understeer in the car, rather than controlling total roll
angle on the body. But if you are never pushing the car hard in turns, then it
may be less important to you.
That's important to me, I care more about handling turns than pounding the quarter mile.

More front sway bar stiffness makes for more oversteer/less understeer, is that how you mean?

Bottom line - I hear you guys saying it's worth adding even a factory sway bar even with heavier springs, so i'll go forward with that plan.