You can't reduce trigger lag without increase ROF. The two are inversely proportional. The motor will help both your lag and the ROF, but the torque up gears will nullify whatever benefit you got. Vented piston head will have no effect. Bearing bushings will also increase ROF, decreasing lag.
Your best option is to go with a J-battery. You can probably get a 9.6V 2500mAh one for less than $60 to your door. Your ROF will go through the roof and you'll see a gigantic decrease in lag.
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