Side-to-side stretches, questions

So STS stretches, is there ONE way to do them?

Reason why I am asking is because I am uncut and noticed most people do them with their palms facing them, whereas I do them with my palms facing down/away.

Also:
What would be the optimal % of erection when performing STS stretches?
I have trouble maintaining my grip partly due to my hands fatiguing, but also my D shrinking after 10-12 reps, which makes it take a lot of time to just get a couple of reps in, my D shrinks, then have to jerk off a bit to get to around 50% erection, placing my grip then do 10 and start over again. Is it just a matter of getting used to?
I heard that people start off by 100, but I can barely do increments of 10 at the time or a bit more depending on how good of a grip I get. I try to aim for 120 reps in the morning and 120 reps in the evening, its currently my 3rd day since I started doing STS stretches.
If there is some smart way to grip around and under the glans without putting too much pressure on the frenulum and being able to do many reps at the time? I would also love to hear it if as I’m a bit paranoid of it getting damaged (have previously had cuts on the frenulum)

0% erection is the best. As an uncut brother I know how hard that is. Thats why I advise you to buy a vac hanger.

I am cut and grip with my hand facing outward. I mix the side to side stretching with jelqing. I started doing 20 jelqs followed by 40 side to side stretches - three reps. I built up to 35 jelqs and 70 side to side stretches - three reps. After the first rep, My EQ builds up to about 40%.

got a cheap aliexpress VAC hanger i plan to begin using soon, waiting for my toe caps to arrive so I can prevent edema. Any advice about periodization when i begin?

I got multiple of those, they work fine for me. I havent used the toe cap (yet) though. I advise you to begin with sessions of about 20 mins on MINIMUM intensity. Trust me, it stretches, but you may not feel it until the next day. Let your first week be more of a ‘testweek’.

How do I know whether something is minimum intensity though? There is no indicator on the device and if I cant even feel it until the next day, how do i tell?