I just came in from outside and I was doing kinda the same thing...I would shoot 3 arrows at a time (25yards)and I would shoot a really nice group and the next three I shootyou would think I just started shooting for the first time today. I just found that the better I shot...the more cocky I got which made me forget some easy fundemantals. I would then slow down and treat every shot like I was in the woods and it was a nice deer that I need to make a money shot on. And sure enough I slow down and concentrate I started shooting nice tight groups again....thats just me though.