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Helical gears are designed to take more torque than straight cut gears. The nature of this theory is that the helical design allows for more contact surface area at any given time; therefore the stress needed to cause failure at a single point (usually a tooth) is increased. This increase in surface contact area also causes the gears to make more noise than straight cut gears.
The fact that your gun is much quieter than before tells me that you have a good shim job. You had a pretty good shim job and just moved it up a point or 2 of a MM. I am very impressed and if I were you I would try to ride this gear set for 100,000 cycles. If you get that then your job was superb.
I need to know: What spring and fps are you running here? What is the gun?
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