Before chains- yes. I had problems with the front sliding fairly often.
Of course with R-4's my tractor struggled to go at all in snow/ice let alone push a 9' plow.
I run chains on all 4, so spinning or sliding from the plow is rarely a problem.
Hey Vince, I'm 6hrs north of you here in Ontario and our snow can be very wet and heavy too. I also have R4's so I guess from the replies, there is a chance I will need to look at chains as well if I do switch to a plow vs the FEL. What I feel I will end up doing is keep my set up for now and just keep at it. This spring work on the lane way and area between the house and building to get it level again. If I still feel by next year that I want to change something then I'll look at some attachment that will act like a cleat on the FEL. I still like having the FEL on to move the snow banks.
By the way, I still see you have the DK35. That is what I started out looking for a few years back. A used, almost new DK35. Rarer then hens teeth to find.