Help Choosing Pump And Clarifications

Hi, to have greater gains the cylinder must be much larger than my penis or slightly larger than my penis, while the silicone ring if I have a circumference at the center of around 12.7cm and around 14cm at the base (due to the cs which flattens out as it goes up towards the glands and which I don’t know how to resolve) and is about 17cm long which should I use? Because there are them in 3 dimensions, should it also be the widest possible one or the narrowest one? And how to increase the girth?

Which pump has the most settings available? I found one that works automatically but I can’t choose the time at which it inflates and deflates

Now i have buy this
https://a.aliex … ss.com/_EwlRdgP