Welcome to the forum matey
It sounds like you are going what they call BPU
I wouldn’t worry about getting a boost controller just double decat the exhaust and get a restrictor ring from Chris Wilson.
The Standard J-spec tubbies will only handle a maximum of 1.2bar (and that’s pushing it a bit) in order to go fully BPU you will need to upgrade your fuel pump to a Walbro, get colder spark plugs, boost gauge, you already have a Fuel cut defender, so all you would need then is a 1, 1.1or 1.2bar restrictor ring. 1.1bar is ok you will get a noticeable amount of power gain from that, I will be running 1.2bar and hope that the tubs will handle it (if not I will upgrade to a single )