I trying to set up a 3 bar +20 cal for the wagon but the boost is all over the place. I have it set for 18psi, get on it one time and it will be perfect, drive around for a while get on it again and it will boost to 20,18,20 like it can't control it. Also if I foot brake it and build boost then take off it will only boost to 12ish psi and won't go any higher unless I get out of it for a little bit and get back in it. I'm trying to use the turbonator for this stuff. Any help is great

Thanks
Andy