Are you still thinking about the QTP's? You will be fine with them as I have noted. And for the twisting of these cars I was referring to is the middle portion of the car, not the strut bar. I have the strut bar too and it only tightens up the front shock towers, the middle of the car needs to have a sub frame connector kit installed to prevent body flex and twist when hard cornering and as most of the Autocross cars will have these so they will be more "stiffer" on the track and not have problems with too much flex. This is the one I am ordering for mine..
https://www.carid.com/bmr-suspension...urlId=80173190