Jay, I've only just found this thread and my thinking is along the lines of others.
Firstly, if you want to use hairs as short as you are I'd suggest good sized hooks and baits.
Conversely, if you want to use smaller baits try hairs giving around 10-12mm space between hook and bait.
I've caught good fish on waters considered to be hard simply by using hairs tied much longer than I'd usually tie. As much as 30mm at times.
Experiment, it's the way forward as nothing in fishing is cast in stone.
Oh, welcome to this cracking forum, by the way.
Ian