I have a New Holland T1110 which is a 29hp rated model with turf tires, MMM, and FEL. I don't have any weight on the tractor itself and use a Woods RBS72p blade. It has the bolts as you originally mentioned for "tilt" as well as side to side adjustment. It covers my wheel tracks when angled, so i've never offset it. I have found that if moving dirt, I mean HEAVY black dirt, here in Iowa, that I cant cause the blade to come out of level if the dirt was unusually hard on one side and not the other. 99% of my work is moving gravel in the driveway which is most flat, so its not an issue for me. I've spread roughly 28t of rock in my driveway this summer with the FEL and the rear blade, and have learned how to make it work well for me. I'm sure a Hyd. top mount and side swing would be wonderful, but the little NH doesn't have a rear remote, so I'm not missing it per say. The mounted blade can dig in as others have stated if your front tires go up, and can skip if the fronts dip into a hole. I've found that a combination of cuts, and back dragging can get almost anything smooth and in good shape. I can usually move almost a full blade full of rock in 2wd, but if moving dirt, 4wd is mandatory.
I plan on building my own adjustable skid shoes and end plates this winter when I get bored. I just can't justify spending $300+ on the Woods skid shoes.