Thanks Greg. Snatch balances, now there's an exercise I don't do often enough. I'll get on it.
I guess jumping back is OK so long as you're balance over the centre of the foot. My problem is that I'm not travelling backwards as such; instead, my feet are simply landing behind my centre of gravity, so I miss forwards. A lot of lifters do seem to jump back though, I think there's a video on youtube dedicated to just that in fact.