Definite design flaw and needs huge chunks cutting out of the rear chassis and even then the ride height has to be set excessively high to prevent the arm / chassis interface acting as a rather solid bump stop .

I'm sure Danny can rectify it, but it needs the rear arms redesigning IMO, along with taking into account Chip's comments regarding adjustment range. However, this may have partly been due to the excessive ride height required, I'm not sure until the car is properly lazer aligned.