Why didn't yer tell me!!!
Wore battered Montrails for the recce... not grippy enough on mud... went to Mudclaws 330s for the race... still slipped on the mud ('cos I'm a clumsy oaf), but nearly broke my neck on wet rocks... reverted to mincing mode for fear of my life... Timed out...?
...surprised I didn't need my headtorch!
Not making excuses really.. too fond of beer and the need to sort the shoes plays only a small part... though I did find myself gracefully immersed in mud on numerous occasions... Mudclaw 270s you say...?