Just my observations but.....yeah, bouncing off the shelf and possibly hitting what you are looking at for the most part maybe, but I'd have to question the consistency as a result of any "bumping" even with good form. I think that when an arrow is a little stiff, you can still be accurate (you wouldnt have that same bumping off the shelf with "stiff"?) ...if you mentaly keep track of where your point of impact is each shot....meaning, if I know my arrows consistently shoot a tad to the left (hold-over principle) , I can easily adapt my shooting to this. Form may not change, but how I aim or what Im seeing throughout the aiming process might. I guess all I'm getting at here is that its easy to get used to and actually shoot pretty darn accurately, an arrow set up that is not as tuned to your bow as one could be! Make sense? I appologize in advance if Im confusing or sounding crazy
Rest assure, you WILL sort this out at some point