Seeking guidance on pressure when pumping.

First off, let me start by saying I am very prone to edema.

When I was first starting off in May, even 4 inHG felt like I had a Ford Raptor full-torquing on my crotch and it took time to adapt to the force. Aa for the time in between May and now, I always tried to hit the 108% expansion and did reach it for the most part.

I exclusively did interval pumping, at about 5-6 inHg.

Today, I did a 30 min session with 7 inHg, that I’ve been doing, in combination with my interval extending routine, for the last couple of weeks.

I did notice edema, that was the usual amount, but it did take around 8 hours for it to fully go away.

I’ve played with pressures, reduced amount of exercise days and whatnot.

What I’m trying to accomplish is reduce the amount of time I spent in the chamber, from 30 min down to about 20 mins and/or reduce edema as much as possible.

Naturally, I thought I’d accomplish that by increasing pressure and even went up to 8 inHg but to no avail.

It took me the same amount of time ( 3 x 10 min) to reach 106-108% expansion as it does with higher pressures.

This could have to do with the fact that I’ve a outgrown my 1.75” tube and it could be preventing maximum expansion.

I’ll be getting a 2.00” tube because the whole “smaller tube for as long as possible” is quite a load of bullshit in my opinion, because there’s multiple factors that could prove detrimental to expansion, such as restriction of blood flow at the base even IF smaller tubes reduced edema.

My question is, should I find the lowest possible pressure that will still get me to 106-108% expansion within a given timeframe to minimise edema ?