You need a better boost controller of you want to run it independent of the N75. Our cars need a ball and spring/bleed valve combo style mbc, like the TurboXS HPBC.
You will also need to log your car in all sorts of boost situations (low speed/RPM cruising, WOT through various gears, etc.) to have a solid understand of your current boost onset. Your MBC will have to mimic those boost threasholds by + or - 300mbar, because if there is any more variance than that you will hit limp mod, your fueling will go to shit, and you will run lean as hell until your engine blows.
Now, all that said, your REVO tune should most definitely boost more than 10PSI. You either 1. have something wrong with your car that needs to be address; slapping on a MBC is literally the worst thing you can do or 2. need to go back to your REVO tuner and have they adjust your tune's setting bc they did not set it correctly.
Get our car all buttoned up, and/or your revo tune issue addressed, then think about the MBC.