Thanks Gaz, I've also used the Molle fitment you've asked about, back when I used to use ciras & ricas vests, having it slap bang in the middle of my chest, horizontally fitted, works really well, especially if using vehicles etc, but crap when your prone, plus you've got to be careful with your sling setup for your primary.
i also sometimes use a Molle bandoleer , another way of running a pretty light loadout high on the chest, & I use a serpa so it's mounted top right, literally high on my right tit, but in order to have an easy draw I had the Molle fitment upside down, that gave me the option of the pistol butt down at approx 45 degrees, works really well.