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I would say that you would not need to sweetspot the reg for Co2, but just adjust your IVG to make sure your not shooting hot, but leave you reg setup for your nitro.
the problem w/ co2 is that it can be released at around 850 psi but can have major pressure spikes when compressed back to a liquid then gas again. (thats what that little vent hole is for on you LPR) the output of Co2 is much more reliant on the outside temp, so it will almost never be the same day to day.
I guess in short, I wouldn't worry too much about efficiency w/ co2 just make sure its under 300 fps for safety.
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