The equipment isn't an issue.... It just needs to work. Light, heavy, standard, minimags, whatever... I haven't seen a huge difference in times based on the actual gun I'm shooting, or the ammo as long as it goes bang.
RFPO requires that you really be solid in the pistol fundamentals to the extreme. Grip, trigger control, etc - all need to be subconscious. And pretty much perfect. I suspect it is the hardest division to get a GM out of... but just barely.
I will likely spend most of my winter just working on those fundamentals. Again. Still. Seems silly, but for a fast game I seem to spend a lot of time working on accuracy....
Second piece for me is vision. This is where repetition and visualization can really help. Because we are dealing with big transitions we have to work the limitations of human vision. The whole 'see what you need to see' is incomplete here - it's not just see what you need to see but see HOW you need to see. Sometimes rapid eye movement, sometimes pursuit eye movement, sometimes wide view, sometimes narrower.
Also - the little tips 'n tricks add up. Foot placement, order of engagement, and even your height all start to whittle .05 off things and eventually that matters.
Lastly - I just became a 'Sr' - and core strength and flexibility matter. Do some yoga!