simonfb, i suspect that your techniques are ingrained from lots of riding over a fair few years; if you were to receive some coaching of some form on how to use flat pedals to your advantage, weighting your bike etc. it might go some way to improving your self confessed limited skillz, err, dood.
that said, i know you love your riding just the way it is and thats what counts, right?
learning how under rotation and riding on your feet work is IMO essential for anyone wanting to advance their handling in fast, technical situations. bottle, quick reactions and fluke will only get you so far!
as for the brake thing, one finger here too. i think the hope m4's with the tech lever are great for 1 finger braking as due to their relatively long lever blade you can get really good leverage which then allows you to run them pretty close to the bars and still get more than enough power. i often get comments on how far inboard i run mine but it really works for me. give it a bash!
levers are now angled up a bit and wound closer to the bar, this pic was pre-setup. i run my brakes 7cm inboard from the grips then do the rest by feel.