There's a couple holes there, I switched to the upper hole.
Thats where i want to be to reduce roll steer and still have some anti squat....no?
Roll steer is dependent upon the angle of the arms relative to parallel at ride height, though, not just the location of the hole.
Which is to say, you tune the LCA location in response to ride height adjustment, not really the other way around. If you lower the rear of the car, that changes the angle of the LCAs, and you have to relocate one end of them in order to bring their geometry back into acceptability. You then fine tune the height of the rear to fine tune the geometry.
Cortex is going for more than that, though. It appears they specify a rake angle of the car, after specifying the front ride height (assuming stock front ball joints) in order to control the relative roll centers. The front ride height is specified not just to control the roll centers, but also to control what the camber curve in roll looks like, along with other things like bump steer.
If you lower the rear of the car more than what Cortex is recommending for that end, then the rear roll center will be different, and the handling balance will change (if I remember right, the roll center drops half as quickly as the CG, so you'll end up with less roll in the rear than you had before, and if I'm not mistaken, that will result in more understeer).
Because of all these factors, I'd discuss all this in great detail with Cortex. The guy who owns it is a mechanical engineer, so he'll have a
really good idea of what to expect as changes are made.