"Mounting them true center WILL NOT harm them. He said many of their athletes mount these skis true center.(However stress the fact to your local shop to MEASURE MEASURE MEASURE)
Mounting the AR7's true center will add a little more pop in the tails however you WILL lose a little bit of effective edge which will not be too much of a concern if skiing only park.
Although the THALLs and AR7's are both not symmtrical, The flex pattern of the THALL's IS symmetrical."
I hope this helps. After hearing what he said i am going to mount my AR7's True center..