Yep, this was your kind of glop. To get any lift for the little log, we had to start the wheelie from ten feet back where there was any traction. Holding pressure was an artifact of riding in on the back wheel. I actually cleaned the whole move up the bank a couple times, after figuring out that little moves don't work in six inches of mud.
New boots are still in the box, although I wore them around the house one afternoon, feeling like OJ in my Italian footwear...