leaking regulator

[Shed tuner]

You have done nothing but alter the reg pressure, so nothing else in the rifle should need changing in order to get to more acceptable velocities.

had the rifle been chrono'd shortly beforehand, this woudl make perfect sense, but it could have been doing 7 Fp beforehand - most likely is crap / sticky hammer I'd guess, unless the spring itself has failed. 85 or 100 BAR won't make a huge difference to power if the rest of the rifle is correctly setup