You're kinda on track, the lighter bolt along with the spacers (included) mean a smaller area within the marker that houses the air for that shot. I actually lower the dwell and increase the regulator to produce the same FPS with less air. My setup is as follows.
PMR - 07
Techt L7 Bolt (new generation with spacers) See Here for all the details: http://www.techtpaintball.com/pmrl7.html
Lapco Bigshot 14" cocker barrel
ST locking feedneck
Dye UL Frame
CP Dovetail On/off
Empire Magna Loader with RF transmitter for Dye/UL
New Dezigns Metal Backcap
My dwell is set @ 18 right now with no issue's. You'll notice right away NO MORE Kick.