the 2018 used to have 125grain tips on them and they were to whippy for some reason the 90 works much better at least to the eye...he hasnt bareshafted or paper tuned at all.... i did guess that the arrows wouldfly around 155fps and you say you got 160 from yours with a heavier arrow, so maybee he was getting a bad read...dunno much about the science of chrono