Id also suggest expanding any CO2 THROUGH the buffer ... end to end ....rather than simply adding a T piece .... thus any unwanted liquid expands in the buffer rather than being added to the flow from the buffer and on into the ram.

The internal bore of the main bottle valves ....that I have measured ... are fairly small and certainly in the case of a paintball tank tiny enough to constitute a restriction.

Paintball valves around 1/32
handwheel valves around 1/8 or 3mm ( feather size )