K% also skews based on walks. K% is calculated by K's divided by plate appearances. That means the K% of a pitcher with a line of 7 IP, 5H, 5 BB, 6K is significantly different than a line of 7 IP, 5H, 1 BB, 6K.
Anyways, let's even assume that K% is the better stat, the difference isn't significant and it still doesn't change the argument much. Bottom line is that in AAA, Wicks had a below average K/9 and an average K%, in the MLB he had both a well-below average K/9 and K%, and so far in ST he has a well below average K/9 and I'm not sure what the ST K% is but I assume it's below average. That can always improve, but pretty much every indication so far is that overall he's been throwing below-average stuff. Coupled with average BB/9, HR/9, and ERA/FIP/xFIP and the results or projections haven't exactly been exciting thus far. But let's hope he can improve.
As for the "pitch to contact" thing, well that's what guys who throw changeups more than any other pitch and fastballs that don't generate whiffs are supposed to do anyways.
I don't expect the K/9 to stay in the 6's, he's projected by all outlets on FG to have a K/9 in the mid-7's. Maybe he does better who knows. Whatever it is, along with all of his other average stats in the small samples thus far, it's another unknown for another SP in this rotation with real potential for average to below average overall results (e.g. ERA) to continue.
Let's hope he surpasses the projections. His 4-seamer was crushed last year, which is where most of the HR seem to come from (similar to guys like Taillon and Wesneski) but his sinker had much better results. If that continues maybe he can make an adjustment and start using the sinker more, but I also assume the 4-seamer helps play up his change-up which may pose an issue, unless he can get the change to sink like Hendricks does.
I still like the guy but I don't see much more than a solid average pitcher in the short or longterm unless the fastball, control, and/or GB% improve. He has potential to eat some innings though.