Assuming a right handed shooter, a tail right arrow typically means an arrow ACTING stiff. While a 2016 would be a little stiff from a sub 200 fps, 50# bow, without seeing you shoot (like in person), can't tell if it's the tuning or the shooter.
A little time with bare shafts might provide answers, though.
For a comparison guide, I shoot 31.5" 2016 XX75 shafts with 5" helical, mounted with a 125 grain head, off a (scaled at a 30.5" draw-length) 53# draw-weight recurve and obtain excellent arrow performance.
Make sure your shafts are properly centered (tip of bare shaft just outboard of your string) and if a stiff arrow spine is your issue and you want to salvage your 100 grain heads, adjust the spine by using the 5 grain washers designed to adjust shaft spine.
A forum community dedicated to bow and crossbow owners and archery enthusiasts. Come join the discussion about optics, hunting, performance, troubleshooting, styles, reviews, accessories, classifieds, and more!