Good job, looks you would have been one of the fastest raw times if not for the Mod cars! Don't give up on the RDSport bar before you try the bigger rear tires or try it in some grippier conditions.
What pressures were you running? I ended up at 37 front, 33 rear, which got me a little rollover in the rear but was really nice for forward traction. WHen I let it creep up higher than that in back I needed more opposite lock under power than I preferred. I'll probably run a little more front pressure next event and see what it does but I'm already at the high end of the sweet spot