He is on pace to shoot quite a few more shots than last year... also looks like you replaced 3-4 seniors and me may not have been your primary scorer. I don't think the -1 or 0 is a problem at all... I think you have upped his distro in relation to the rest of the offense and his shots aren't the same quality of what he took last season.
He didn't even start every game last season and thus probably drew a much ezier assignment to shoot from when he did shoot.
I believe the sr curse is very real... but I believe it is an end result of the change in team chemistry, or in using a player differently from one season to the next...and not some special code in the engine