One thing I would add to the above great advice:
The most important thing to do to cut time off a stage w/ your plan is to eliminate shooting positions. I see way too many newer shooters trying to eliminate reloads by adding a shooting position here or there. You certainly don't want to get caught with a flat footed reload in the middle of a target array, but stopping yourself in full motion to shoot an extra target just to save a reload later in the stage wastes a lot of time. Shoot the targets in the most logical/efficient order, and then figure out where to reload in between positions to make that happen.