The added ballast is doing a few things:
1. Lowering the car
2. Adding camber
3. Changing the center of gravity
4. Possibly altering corner weights
I experienced a similar issue with my coilovers. My first track day, the car was plowing like crazy. When it was totally full of gas, it got very neutral. I added a bit of camber up front and all was well.
That having been said, i prefer slightly lower ride heights than topless. I'm probably 2" lower than stock up front and 1.5" lower in back. I like zero toe front and just a TOUCH of toe in at the back (pretty much zero). If you drive mostly on he street, go with topless' ride heights.
Try -.8 deg camber front and -1.4 deg in back. Consider getting it corner balanced.
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