Changing the the metrics of that drill would defeat it's purpose. I've yet to see anyone shoot that drill at speed with anything approaching the level of accuracy you are suggesting. Accuracy generally degrades very rapidly after the 2sec threshold is reached as people tend to mess up the second target. If you can shoot it better I would appreciate your instruction and insights.
If you don't mind the feedback;
The repetition and cadence you display is consistant and methodical. Assuming everything is in the black 8" circular target indicates to me that you have attanded a certain level of comfort shooting the drill within the allotted 2 seconds.
Your internal clock has likely memorized what that 2 seconds 'is' and you have either consciously or subconsciously mapped out where you need to be during each phase of the drill. At some point that comfort level transitions to complacency, where sight picture anywhere on the black is 'good enough'.
If you are happy with status quo, then keep doing what you are doing.
The gun is capable as are you so if you want to get better, you need to push the limits of your drills and change them up. I'm an accuracy nut, so my belief is if you can comfortably do that at 5m in 2 seconds, it is time to work on 10m in 2 seconds, then 15,20,25, etc.
Shoot competitively (it is beneficial and augments drills alone). Get your buddies on the Island together and incorporate your drills into a CQB match at your local range. Talk to Hungry and Tiriaq on the board here about the ORA's CQB course of fire for a start.
We were shooting that drill in CQB matches out to 50m and it can be done (keeping rounds in the down zero).