I thought of that also, but Roger said he didn't want to modify it, would sell it and get a truck mount instead.
Cut a slot where the front bolts are and put a big pivot pin at the back, like this.
View attachment 333082
I can understand your dilemma.
The design of that blade doesn't allow for it to raise or float unless the loader it's hooked up to
does the floating. In this case, there's too much weight on the blade, catching too much gravel.
On my Kubota, I have a similar blade, "no loader", and it has a "lift" cylinder also for it.
It does have the float option and only carries the weight of the blade itself,
something your trying to achieve.
Your only option, IMO, is to modify it,
or sell it and purchase one that does "float".
On another Kubota I had, it did have a loader, I modified "plate's" in the bucket so
my "power angle plow with float" would slide into it, as seen in your video,
worked great, as the loader would be about a foot above ground and the blade
would "float" the ground surface.
Good luck and let us know what you decide.:thumbsup: