Maybe you could paint the loader bucket with cooking oil. Its environmentally harmless.
For rollover stability on my present YM186D I turned the hubs around and mounted the wheels external to the hubs, the widest possible setting. There's no shoulder on that side to center the wheel so its essential to occasionally check that the lugbolts are snug. This isn't a recommended configuration but I felt I needed the width for safety.
Turning the front wheels around does nothing since the front axle hinges in the center, it doesn't resist rollover forces until its too late.
I sanded the faces of the rear hubs that are now the outside, to assure they were flat. I didn't have to take off more than just old paint.
I also filled the rear tires with water, and mounted 77 lb wheel weights external to the wheels (
photo) where they give the best leverage against rollover.
Here are some more 77 lb wheel weights I bought. I might mount these one each on the inner faces of the wheels, or possibly double these on the outer side of the wheels. Or put them on the larger Yanmar if I ever take the backhoe off that one. These came off a 20 hp
Kubota (I didn't add that link to Kubota corp, ignore it) with factory loader, where they were mounted double each side.
Are your rear tires loaded (water filled)? That's an essential first step.