did you intentionally go from 70 - 75#'s, or is it a result of putting the new string on? i'm asking because... just because your cam(s) may be lined up doesn't mean your back in spec's., your ata can be long, your brace height short, and your cams can line up. if you didn't intentionally go to 75#'s something's off.

other than that i'd say yes, you may well be. were you saying your arrow is 27" long, or your draw length?