Tried some more shots with my new gate/delay circuit. I know it's a cliche, but there are good reasons for using milk drops for this kind of thing, mainly that it is really quite easy to get some quite dramatic shots.
It's also a lot easier to trigger the sensor with a milk droplet since it absorbs the light better!
I used 580EX at 1/128 power this time - much shorter flash duration than the AB800 and consequently much better action-freezeing effect. Also chose a more suitable lens rather than using what happened to be on the camera at the time!