yep. running 30% does require more refined tuning, but once tuned right, your motors should run cooler by ave of 10 or more degrees
i had a HB Lightning 26. broke it in and ran about 2/3rd gal of 20% thru it. ave temps were about 250ish *f. switched to 30%. added a headshim. did a quice brake in for the 30, and ave temps afterward were high 220s, low 230s. lost 20*f swapting to 30% on that motor.
run BO 30% in my Jammin JPX .21 after a 30 minute main im about 225*f.