Thanks guys, really interesting to see all the different takes.
DJ, I was intending to go 12 inches overhead as my surfing one is 8 and the cheapy I'm using for DW atm is about 10 and feels too short. The few DWs I have done so far sounds like you describe where you often drop off runners and have to get going again - although I think my crappy technique is not helping

Bottom line like most things, is to try a couple of different blade sizes methinks.
Cheers