Good Read
Under "Practice the Entire Sequence" did you consider the different action types? DA/SA v SA. ie: run the gun the way the manufacture intended. Sig & Beretta first round DA then SA; followed by a decocking then back to the start v Glock, XD, M&P taking finger off trigger is the safety; v 1911 disengaging the safety, firing then reengaging the safety. What about adding a Tactical Reload at the end of the sequence? Reason I ask it it seems 90%+ of the people out there want to only run DA/SA, and Revolvers in SA only; okay get a different gun IMO and MO only.
The following may be covered in a different article (or an idea for your next one) how to increase training time at the range. Set up a type 1 malfunction (Failure to fire; empty chamber loaded mag or download a cylinder one round) point in squeeze, click no bang, clear malfunction continue. Yes, this is artificially set up but gives you one repetition per loading.
Add a tactical reload after a string of firing.
Every time you pick up a magazine from the bench out of your bag (or back) have the mag indexed properly. Hey it is more Proper Practice and building of muscle memory.
Keep Score/Don't fool yourself. Fire your string, mag, iteration, etc. Bring the target back and score it. If using paper plates, index card etc this is easy how many hits, write that on the upper side of the target, tape it up/hang a new one and continue. Your example of 18 million holes, yeah when when do you fire that one right there?
Holy target backers. If you can't get a clean target backer hang a great big one backwards so you have a clean surface for practice. No sense in jerking rounds low right all day long and not being able to diagnose what you are doing because there are a billion holes before you got there. A $2 target for a clean backing gives you more feedback so you can improve.
Depending on the range you are using, and what skill you are trying to improve ASK IF YOU NEED SOMETHING. I desired a chair when working on simulated long range for long guns as going prone was not allowed. The range was more than willing and happy to loan me a chair from the class room so I could use their benches. It was not perfect but it is what could be done at that range.
Just some thoughts