Sway bar with large diameter t-bars?

In some race only chassis it's possible to not need a front sway bar. In a relatively heavy car especially front heavy car will always need a front sway bar. The torsion bar and sway bar works together to control the roll. Your car needs X amount roll resistance which is handle by both the torsion and sway bar. The bigger torsion bars help but I'm sure your car still needs more than the stock front sway bar.