I run the front belt a little tighter than the rear belt. This is because I want the overall slack in the drivetrain to be about the same front to rear. If the belts had equal tension, the longer front belt would produce more slack and the rear wheels would get drive a little sooner, which would result in an initial rear wheel drive effect both on and off throttle, which generally produces a loose feeling.

The new TC7 belts grip better, so they don't need to be as tight. The rear is as loose as I can get it without skipping. Normally if set correctly in TC Mod, when you push down on the belt about an inch away from the spool, it should flex about 1-2mm. Then I set the front just a bit tighter than that.

Also, be sure to check them after a day's racing if they're new as they might stretch a little.