Maybe try opening the existing 2nd reg wide open which should put it’s set point higher than the first reg and see if it gives you the power and speedy follow up you are looking for before you make any other changes - just a thought👍🏻
Hi there, he must be using another Maverick/ Dreamline power adapter FX part# 20268 ? should be available from FX USA. Haven’t seen Ernests gun you refer to, so also just guessing👍🏻 Good luck