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What you observed is normal...try 0.25's and you'll probably get around the same velocity.
Gas systems are not the same as spring powered systems...unlike an AEG where the amount of force is constant, with a gas system there are more variables in play.
The way the gas system works is that the BB has to exit the barrel before the recoil portion starts. How much gas is dumped down the barrel and how quickly the recoil phase starts adjusts the resultant FPS. Redwolf has a good write up on GBB systems...just picture that but bigger for your rifle.
Long barrels, lots of gas = high velocity
Long barrels have the "room" for gas to expand (where as pistol barrels are really too short to let this happen fully and you'll see more of a variation for different BBs).
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