Honestly, I never wrap at a set temp. Every brisket is different. I just go by the look of the bark and the feel of the meat.

Honestly, you got lucky that worked out. Isn't that a lot of extra coolant concentrate you're burning through for a marginal gain? Tbh, I've seen richer mixes just make a sticky mess that causes more problems, especially with tramp oil. It seems like your tool or your speeds and feeds were off to begin with if you were building up edge that fast. Fixing that is usually better than just dumping more coolant in.