RE: First Shot Counts!
Well you asked for opinions so here's mine.
I would'vebet $1MIL that it was your form, grip, anchor, or combo of these. I only say this because you said you haven't shot since last season. It's hard to stay consistent when you haven't shot for a few months.
In my own practice sessions, I don't move anything on my bow until I KNOW that I've got my form down to a habit. In fact, if I were in your shoes, I would not have moved anything for 2-3 practice sessions.
I'm no where near an expert, I was giving you what you asked for.