Here’s the video I mentioned earlier in the thread of the x30 being capable of 17hg of pressure
To answer your question about whether using manual stretches would promote permanent gains this is a neat thread that helped me in forming routines Understanding force thresholds for growth
Basically if you max out the pressure on the bathmate right away, it’s very likely you will see results. That said, if you max out the pressure the way your penis will respond is by "toughening" to be more resistant to future pressures. What that means for you as far as PE goes is that you would continuously need more and more force to see comparable results, and as a newbie this is not the best route because you might still have some "easy" gains left.
I’m still in the early stages of my BM ownership so I’m hesitant to give opinions on what kind of results it can give in the long term, but definitely take what kingscounty said to heart.
To start out I would use as few pumps as possible to seal it to your body and maybe do a few small pumps to slowly increase pressure while you’re in it. My general rule of thumb is to never pump over 1/3 of the possible pressure because I figure 17/3 is about 5.6hg which seems to be around what a lot of air pumpers use as a max. The way I have started to use it is just barely get it sealed to my body, let it sit for a minute or two, and slowly start to kegel.
When I saw barely sealed I mean I have to hold it in place but there is certainly pressure inside the tube. I kegel until my length extends further and then let it sit, I’m still flaccid but you will be able to see that it’s getting "pulled" by the pressure, then I slowly add small pumps but making sure I’m not going over 1/3 max compression. When I say small pumps I’m literally pushing the lightest amount possible to barely make any water come out just so I have the slightest increase in pressure. I’m usually in the tube for 5-10 minutes at a time and I don’t think I’ve exceeded 20 total minutes in a day since I’ve gotten it.
I might be paranoid about it but I think that a lot of BM users don’t see permanent results because they are using much too much pressure because even though the unit is such a good concept it’s poorly designed as far as PE is concerned. A good rule of thumb is if you feel any strain in a BM you are definitely overdoing it.
Lastly be careful when you’re finishing up with the BM and you are decompressing the chamber, don’t let all of the pressure out in one quick burst.
Sorry for so many longwinded answers I just feel like there’s not a lot of really honest things out about the BM. Your routine looks good and the 1 on 1 off schedule seems reasonable. I like to use the app when I’m not using the BM because I’m usually in the shower or bath, you can usually work out good kegel routines on your own in the BM going off of how it feels after you get the motion down.
Good luck!