Cheers Snides. It was a ripper. One of those rare occasions when everything just goes right!

Mals dedicated Alpha fins are still in the computer AFAIK. I have been using the TM speed 26 which is his symmetrical speed fin for moderate winds. Not the sort of rake like you need though for that weed stuff. ;-)
It would be very interesting to try one of these fins with the extreme rake you guys need but since the bases and fins are moulded in one piece with fixed rake (12 deg I think) it's a bit tricky to try.