Jelqing With 90% Erection

So I have read on several threads that you shouldn’t jelq with more then like 70-75% erection but I havent seen why even when searching. Is it more likely to cause an injury or is it simply ineffective? I ask because i am not that great at keeping half an erection i either am 80+% erect or it goes down to flaccid very quickly. So for the past 10 days or so i have been jelqing while being pretty hard as its easier for me to maintain. Other then a few small red dots on the very tip of my head all seems ok but I want more info on why this either is bad for you or doesnt work. Thanks

You just don’t want to be stiff hard. As long as the shaft is still flexible, you are OK, because the tunica is still able to expand as jelqing brings in more blood pressure.

Ok will have to watch it then as probably 50% of the time im jelqing its stiff the other 50% its flexible but not very.