An inline reg will add a third regulator to the air line. Each regulator reduces the air flow a bit. One of the requirements for a sustainable reactive trigger is air flow, so an additional regulator will reduce the ability to be reactive. Each regulator reduces the high volume usable air pressure by about 200psi. So, even if you have a 1100psi tank output, you will only have about 900psi of usable pressure which is only slightly higher than a regular non-adjustable tank.
The best way to help make your trigger controllable and reactive would be to purchase a 0.740" on-off pin which is 0.010" shorter than a standard 0.750" pin. Install the quad emag oring instead of the urethane oring for the small top on-off oring. This quad buna oring has less friction than the urethane oring but has a lower sealing point which is why you need the shorter on-off pin. If you want to adjust the amount of reactivity, add a shim or two between the on-off halves to simulate an even shorter pin.
A short gold bolt spring will reduce your chamber pressure used when shooting at the desired velocity. This will increase the pressure differential between the valve input and the chamber and enhance the reactive effect.
Except for the Automag in front, its usually the man behind the equipment that counts.