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What's the twist rate of your barrel? It may be hopeless to try to shoot any heavy subsoincs. AK's weren't designed for that. What altitude and temperature do you typicall shoot in. Denser air hurts bullet stability too.
Perhaps your subsonic loads aren't really subsonic and are in fact transonic.
Then they're likely to be very unstable and could go anywhere. I didn't see any chronograph readings in you post.
I'd suggest to Load some 150 grain flat base bullets down to 950 fps and see how they do. Then work back up in velocity until you start to see a shift in point of impact. You should expect have to re-zero when changing loads or adding a suppressor but you want to avoid any load where you see a large change in POI for a small change in the load.
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