(Alert: I posted this same topic on Standup Zone, the US based site, so I apologize if you come across it twice. I am guessing that there are a lot of great Aussie surfers who may not track that site, and I did not want to miss their input.)
This summer I have been working on what I think of as the three different paddle technique options during frontside cutbacks:
1. Doing a hard sweep with the paddle on the toeside to help the board turn into the cutback. In this technique, the paddle is being used as a turning force to help push the board around, or even to pull against to break the fins free.
2. Skim the paddle lightly back along the top of the lip at the start of the cutback until it is directly behind you so that you can basically sit on it during the latter phases of the cutback to get more body angle on the heel rail. In this case the paddle is not being used as a turning force, but as something to lean on in order to get more leverage on the heel rail during the later portion of the turn as you are coming back towards the whitewater. Colin McPhillips is my favorite image for this move:
Yes shorter leash could help although I went for a 7' leash recently, which was fantastic for quick board retrieval after wipe outs but regularly gets wrapped around the fins when paddling which is a nightmare! Obijohn, i think its a combo of technique #1 and 2 you want, 3# no go as takes to long/upsets the carve and is not neccessary unless you're going into more of a roundy. I've found the best web resource for short SUP technique is "Paddlewoo". Eric is a powerful concoction of passion, techincal expertise, inquiring mind and quite frankly inspiration.
Colin seems to wear a leash in the vid.
I use a 6' leash, even on 7'6" boards. I even used 5' leashes on my 6'8" at some point. But it never wrapped in the fins.
Perhaps you may want to stretch it a bit (warming it with hot tap water?) to get rid of the "folds" in new leashes?