I really wanna try those tires out. Do you know if they are available after market?
I got some HB Rovers and Steph and I went to compare them at Petrie Island. He added weights to his stock tires whereas I had none and didn't modify the foams that came with the Rovers either.
Bottom line is, the stockers suck and the Rovers Rock! The Rovers have way more traction and the extra ground clearance helps too. However with the extra traction my torque twist is worse so I was rolling more easily than Steph, so I'll have to work on that now. I'll relocate the top shock mounts, the upper suspension arms at the axle, and add weights to the wheels.
Steph got the Hammers, he plans on being at the comp this Thursday but I can't make it. Hopefully I'll make it to the outdoor comp.
Ryan, you can have my old tires for free

Richard