Control. I think this is a big part of the problem between stand up and prone. Most prone surfers can control there boards as there is a lot less volume to hang onto. with short boards especially, its a simple duck dive and your out the other side and paddling again.
As a stand up surfer we all know that most times when hit with a good sized wall of white water its game over. The result is aprox 10ft of board and 10 ft of leg rope wollering around in a 20ft radius ready to clean up anyone around.
Here is my simple cost effective 95% solution.
I have always found that after getting trashed by either the wave you were on or the following set, a minute or two can be spent getting hammered, so I grab the leg rope near the board so its close to me.
Trouble was, it some times gets ripped out of your hand.
When your in the zone the white water goes over you 1st then over your board and you instantly come up to the surface ready for the next one. when the set has gone, back on the board and paddle again.
This handle works great in surf up to about 4 to 5 ft as that's my personal limit. bigger than that I don't know.
It cost a hundy to put in. the handle is just the same as the end of a leg rope.
Of course this may be one solution to the issue as we all know that there are a few.
Over xmas on the whangamata bar there were 60 sups on the water. Any other surfer didn't have a chance.
To me that's says theres 60 sups on one bar, that obviously don't give a dame about anyone else.