At the IIC (med bite) the car had more of an oversteer than loose feeling. By that I mean the car was super locked in unless you turned the wheel hard, then it would break free pretty hard (not a very controllable slide), which is why I could pivot it around the 180 or something if I needed. Which is why I said the setup is dialed if you like lots of steering, it allows you to put it where ever you want it. Here are some things I would try though to tighten up the rear end or make any slide more controllable.
-first, just sauce less front tire (I did 1/2, try 1/4)
-stand rear shocks up one hole
-change rear WB to med/long instead of med/short or longer even
-raise rear hinge pin .5 or 1mm and go to silver rear bar so the suspension pressures the rear tire more instead of rolling as much, and then the silver bar will allow the rear end to roll more. Do these 2 changes at the same time.