BC, I'm pretty confident I have a good release. I've been shooting recurves for somewhere around 50 years now. Long before compounds even existed. I don't 'pluck' the string like a lot of new shooters do. Shot my share of deer, rabbits and even a couple grouse while in a treestand with my recurves. My first buck was shot with a Bear Grizzly 40#.
I was thinking the same as you - If I can cluster the 1916s into nice little groups the 2115s should be even better. I'm going to see if I can get my hands on a couple 2018s to try.
Like reloading ammo - always looking for ways to improve. Sometimes it works sometimes it doesn't.
BTW: Even with papertuning (checking), I was getting almost perfect tear with the 1916s, but a ragged hard tail right tear with the 2115s. Seems if my release was sloppy I would have gotten a tail left tear. (left on release, right at riser then back left)