There is more too it then because I can garuantee that between 285 and 310, your pin gap will never change so how much faster could your Guardian have been. I suspect more of a tuning issue or other factor.

The difference you missing in score compared from last year cannot be blamed on the bow, there is more to it. AT 284, you shouldn't be seeing a 6" drop on 10 yards and honestly, are you off 10 yards on yardage estimations?