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I am about to regulate a custom .177 discovery based gun to sub 12 ft/lbs. From limited previous experience, I open everything up for max flow, including the valve volume. I port match everything- starting with the barrel port at 75% of the bore. I work it back from there- barrel port, transfer...

I got rid of the spring and replaced it with a spacer ( item 6J). No need for the spring I didn't think. Others will like a different feel and slightly heavier trigger

http://www.gatewaytoairguns.org/GTA/index.php?topic=49943.0