Another person you can ask is JS alternators. They're mostly on facebook so you can try messaging them there.My alternator is in fact regulated
"If you have the 2 wire plug (I do) called LIN bus ideally we need to stay on that plug. The bigger alt will stiffen voltage the way it should, that regulator design just does not allow us to achieve a higher voltage set point"
I personally wouldn't bother if you can't bypass the regulator. Total waste.
Your front battery voltage should equal your rear battery voltage. If it doesn't, your wiring is bad.