Regulators are easy. Long but simple. Take a lot of different missions where you are rewarded with regulators and make them. These are specific things where you can see how. I had no problem getting all my suits up to level 5 just by getting regulators as a reward.PSA: please don't do this if you want there to continue to be anarchy settlements. If you really need lots of power regs, the thing to do is to use Inara to find a system with lots of settlements and many factions in negative states. Go there, take as many restore/reactivate missions as you can, and abandon them to keep the regulator. You can get 50-60 this way before you go from neutral to hostile with the factions.
In the case of predictions, it's like finding a black cat in a black room, maybe or maybe not.