Question about erection level for jelqing

I am a bit confused on the erection level for jelqing.. Like what is 50%-70% erection level? Can you you please put it in terms of the degree the penis is “standing attention”. For example, a 50% erection is a a full flaccid, but is not able to point out at all. Or, a 70% erection level is slightly standing straight out but not completely. I would just like a different way of measuring erection level to make sure I’m doing it right. Also on a different note, does anyone else experience different a erection quality due to stress? My penis goes into phases where it’s really hard to get a “full” erection. This week has been stressful due to finals and right now, even if I watch porn and get my penis as hard as possible, it still won’t be as vascular as usual and just won’t feel completely full. It is directly correlated to my flaccid state. If my penis is a bit shrunk due to cold or stress, it won’t feel full. If it hangs low, it will be an awesome erection. Will PE help with this? Thanks in advance, this site is extremely helpful. I am still in the process of deciding whether or not PE is right for me.

I think that 50 % erection level is when it’s a little bit like getting fluffy and starting to get semi erect.

And 70 % erection level i think it is more erect than tge semi erect.

I do it like that when i jelq with 50 % erection level for length.

50% is a semi erection, to decide which level you are at imagine that 100% would be the most rock hard erection you’ve ever had.

90% would be your regular hard erections and so on