I also have a Stock II in 40. I’ve shot 40 minor for many years. I do love Clays (regular Clays) for minor, but for some reason I’m finding that Titegroup is gaining on me. I’ve always shot 40 minor in polymer guns and maybe that has something to do with it. I’m not sure what it is exactly. All of my loads were based on 180gr bullets. I have played around with 200s but it’s not worth it in my opinion. I don’t have a real opinion on 165s. My Clays load was 3.0gr @ 1.135 My current Titegroup load is 3.5gr @ 1.135 I do LOVE WST, but for major loads in other guns. Not for minor.
I was going to go this path but you beat me to it. It’s hard to convince someone that has wrong powder to get the right powder. Especially when they got it for free. At a Glock OAL, HS-6 could be bad. Even if major is not achieved, you’ll have unburnt powder in the gun. You won’t achieve much with HS-6.