Get rid of the plough and get an excel from KM. Don't worry, you actually get it from Chains Ropes and Anchors, and as far as I know KM never actually does any work, so you wont run into him, you'll probably deal with Alan, who is knowledgeable (just don't mention YNZ). Anyway, get the excel, anchor as normal. You wont drag.
I got one, now I have to tell everyone to sit down when backing down. A plough will drag all over the bay. It is near impossible to tell if they have set. An excel sets in 1.5 times its length.
I have photos of when I trialed it at Arkles at low tide. I'll see if