ghanging your nocking point will not change youre center alignment but what I would like to know is, do you have a single cam bow or a dual cam bow and did he shoot an arrow thru paper to determine whether the nocking point was too high or dwa that his opinion?

Most single cam bows need the nocking point set at least 1/8 or more high usually more than 1/8" and more like 3/16"

If it is a dual cam bow most paper tune better if it is 1/8" high.

just because he works in the archery department dont make him a pro.