I’ll be honest, as of right this minute you’re not going to do a lot better than where you’re at.
You can get more efficient, you can get more intensity, and you can get a better light spectrum. But you can’t get all of them in a single package. The next bump or two in technology isn’t likely to be a major improvement over what you have. You’re best bet would be to run a couple of harvests and slowly stash some cash for what may be out in a year or so. That will also give you experience with what you have, and you’ll know better what to look for on your next purchase.
In my opinion, you have the best balance of intensity and spectrum in a single package. We’ll see what the 90 cri qb’s have to offer, but it’s not likely to be a night and day difference. Cutter apparently went back to drawing board on their mid power package with lm301b over 561c. Unless they have an unreleased bin, that’s literally a 1 lumen increase at same power. So literally 300 lumens over entire board, or not even half of a cfl.
You’re good dude, sit back and enjoy the ride lol