i was a little worried about that at first, i didnt want gate chatter or anything. Initially i put full boost from the big charger to the bottomr of the gate and nothing to the top, just wanted to make sure i was on the safe side, the truck wouldnt make more than 50psi absolute so it was a dog, i basically unhooked the hose on accident and found that it worked well
Note on the "manual controller" it states to hook the boost reference to the regulator, then from the regulator to the bottom of the gate, they state just like the spring controled to leave the top open and plug the remaining bottom ports. Essentially the same thing as turning the regulator all the way down
So an alternate solution for you would be only running the boost reference to the bottom and see if that helps, or even running maybe full boost from the big charger to start out. Not saying any one way is going to be better but you have options here that might help.
The thing i like about the spring pressure is if the boost line comes off, breaks, burns up ect the fail safe is there. just some food for thought.