Today I was surprised he only got tagged for 3 runs, however there are at least 2 or 3 starts where he looked like he was K'ing a lot of guys but ended up formfitting lots of runs and yielding a huge BABIP. Looking at his numbers right now I also see a pretty low LOB%, in the top 30 starters across both leagues only he, Wainwright (who has really similar numbers this year) and Gray have LOB% below 70%. Also out of all the pitchers on that same list he has the highest HR/FB rate out of everyone by a good margin at 18%.
Also I just looked at him vs. Sanchez, and wow. In very similar innings pitched coming into this game (178 Stroman vs. 173 Sanchez) Stroman has a higher K/9 and a lower BB/9. Also generates 5% more groundballs. For some reason, with my eye test I'd say Stroman is getting outpitched by Sanchez, but in very similar innings pitched coming into this game, he has struck out 11 more batters and walked 13 less than Sanchez. Was not expecting to see this at all, he's pitched quietly well down the stretch while the last 3 sanchez starts haven't been really that great