I have done everything on this car according to this forum when it comes to low grip conditions, except for moving the esc behind the motor (it's to big), nothing using the SV2 arms nor drilled the 3rd hole on the arm. I am using Tony's ICRC setup and currently have 60.3% weight in the rear. I race at Mike's in Porter, TX. This track likes the 3Ds tires in under normal condition. However, with current settings my stock B5M is way faster (28 seconds versus 31 seconds lap time). The B5M has about 63% weight in the rear. So, to get more weight to the rear I cut a peace of sheet metal about the same size of my battery (see pictures). This sheet metal is 16 gauge (1.59mm) and is the max thickness you can use (belt is very close to the battery) and the weight is 47 gram. When installed under the battery, the weight in the rear increased to 60.6% so that did not improved much. Putting the weight over the rear bumper (see picture) increased the weight to 62%. Tony had a Trishbits brass weight that could be installed over the bumper , but could not find any online. Has anyone tried adding weights to the rear?