Now next step is to ease the pump action as much as possible. You do that by:
Replacing all springs with lighter springs (all springs i.e. the both spring that open and springs that close valves).
Polish pumpgrip internaly and body/barrel externaly where the pump is and then lube that up as well with some silicone and a tissue. Just have enough on there for it to shine a bit that is enough.
Then convert that bottle to a Siphon bottle so that it draws liquid. That way the valve doesn't have to stay open as long to let the same amount of CO2 through. This might cause the first shot or two to be somewhat slow but that is easily mitigated by turning the marker upside down and "dry fire" a couple of times.
[Edit]
Sorry Ill never try to type fast again [/Edit]