Looking great so far Glenn. I agree with Andy, and I find that if you keep the brush 'on', and move on to, and away from, the 'target areas', increasing the pressure as required, it makes things smoother, and avoids 'splatter' and over-sized mottle.
It's difficult to explain, and obviously much easier to demonstrate, but if you grasp the basis of what I mean, have a go on a scrap model, a piece of card, a passing vagrant, whatever, and keep the brush moving. You'll soon find the most comfortable method.