I feel for you nuge........I had some bad target panic at the beginning of this season. Like you, I do well at the 3D range, but put meat in front of me and I waws falling to pieces. The last deer I shot I looked at the horizon before I drew. It calmed me down a little and helped my form in that I drew horizontally, then bent at the waist - something you're supposed to do from a treestand. Looking at the horizon had a dual positive effect for me.

Good luck.