Confi,
Welcome to Thunders!
Your question is a difficult one to answer because really only you can determine if you are at 100% EQ or if there is still a bit harder that you can still go.
The measurement process should be consistent, but it’s not perfect and there are indeed variables.
If you can easily conjure up a rock hard erection, then just take it to ten and get to measuring.
If it takes you some work, then take the steps you need to take on those measurement days. Sometimes we might even need to wait to the next day because our cocks just aren’t cooperating.
The goal is to get your erection to 100% on measurement days as this helps to eliminate variability of EQ from providing false gains.
Only you can determine if you are at 100% EQ or not.
Thanks for jumping in and let’s see how others might approach answering this question.