I tried a 2018 and had the same dive you are talking about. It hit below my 3d deer target. WW's will slice right through a field point target! Ouch!! 2016's and 1916's slam home with regularity, so I just stick with them. I've never had a problem with either shooting weak. Jason Kendall (JK Bows) recommended 1916's, which he shoots through his 52# Kanati. I figured if they worked for him they'd work for me.
I can't explain it either, but O.L. should be able to help you get them tuned if anyone can.