Mechanics and Fixing Any Questions Answered

the rear pair have worn extremely quickly vs the front. Anyone else had this, or am I doing something wrong?

I'd say the thing you're doing wrong is using your rear brake more than your front. The front should be the first one you go for, and pretty much only use the rear sometimes to tighten your line when cornering, or for the most minor slowing if you have a brake on the back with less advantage, like a single pivot sidepull or a canti adjusted to maximise modulation.

The reason I say this is that your emergency braking reflex should be all about modulating the front brake and balancing your weight on the front tyre; anything else is a distraction from the main game.

I'd even recommend riding without a rear brake for a while.