IMO the problem with a rigidly mounted system is that when you angle the blade one side of the will be higher and the other lower. Thus one side will dig into the ground unless there is some ability for the blade to independently rotate somewhat around the axis that runs through the tractor from front to back. When I used my FEL float position the blade had a tendency to ride up the snow. If I did not use float the blade wanted to dig into the gravel due to the oscillating surface of the ground. It was a never-ending battle to keep the loader height in the perfect position
I ended up switching to 7' Western mounted on my FEL using a chain for float. I like it much better.
I initially ran with chains on the rear but the front end would want to slide when I made a turn even in 4x4. This year I added front chains with the rear chains and can plow in 2x4 with no slipping in turns.
Here are pictures of my two plows


I ended up switching to 7' Western mounted on my FEL using a chain for float. I like it much better.
I initially ran with chains on the rear but the front end would want to slide when I made a turn even in 4x4. This year I added front chains with the rear chains and can plow in 2x4 with no slipping in turns.
Here are pictures of my two plows

