My sessions I'm shooting probably close to 100 arrows, how many are you guys sending down range each time you get the bow out? That might make a difference too.

That's insane. Definitely never shot that many arrows in a session. Now that I think about it, I've probably only ever shot something like 40 arrows max in any given sitting.
I agree with the comments on quality versus quantity, fatigue issues, etc. I think for most people the small stabilizer muscles fatigue rather quickly. I start shooting right about now. After maybe 15 arrows I can tell that accuracy is already decreasing. The comments about the first shots being the most critical, definitely correct. When the hunting season starts and the days before, I only shoot a few arrows a day.