Replying to Salomon thruster center mount

I just got a pair of thrusters (last seasons) and I asked the local ski shop to "center mount them". When I got them back, They were, without a doubt, not in the center. Now I live in NJ so there is no such thing as back country and powder where i live. So I ski the park 98% of the time. So am I really missing out on my ski's full potential? Should I get it moutned true center? And if so, how, because the local ski shop said they couldn't do it because of liability issues... I think thats a load of BS.

Thanks for any help!