I never understood why people always feel they need to improve upon something that doesn't need fixing.
This may sound harsh but leave it alone until you can shoot it under 7 seconds adjusted time. Once you can do that, then think about changing it....if you can't do that you need to focus on shooting the drill rather than brainstorming ways to improve the drill.
It isn't meant as a reload drill...it is meant as a speed drill which is why there are 3 strings.