Not all erections are born equal
I remember measuring every day, just to see if there’s a difference,
I noticed that each erection is different, not by much, but it could get to 0.5 inch of difference in rare cases.
One more thing I noticed, people seem to think that masturbation hinders the gains because after you masturbate a lot your erections are a bit “smaller” (as in the penis is smaller in length and girth), that’s temporary and will change back to normal once you give it a rest, from my experience anyway.
(still waiting for the autoxsleeve, hoping for the best :) )