Different strains will brix higher than others, so when you find the balance and maintain it, you let the genetics shine thru, which is the whole point actually, so if you do the exact same thing every grow but with different strains, you will see different maximums.
Don't get upset if you do a run and they just won't go over 18, and smile like a bandit when you find a strain that will give you a 23.
Just keep doing what your doing and let your stash grow. The brix will be what the plant can give you if you keep showing them the love
You caught on to brix quickly. Kinda nice to not have to worry about bugs hey?