Well traditionally loaders are best left for loose materials such as piled gravel, manuer, chips, snow and brush with a grapple/fork. Lots of stresses generated by those long lift arms and lots of potential for damage digging into the ground. That being said, I use mine occasionally to cut into high spots and relocate it to the low spots and it does that very well. I do have pretty soft sandy soil and I do this type work very slowly so as not to shock load the structure. I am also not using a Jinma loader on my 284 and have no experience with that loader. A toothbar on the bucket would help to break up the soil but I don't do it that often to warrant that type of modification.
Ground engagement is best left to a box grader or scraper(my next tractor build project). The 3PH structure on the tractor with it's shorter arms loaded in tension is better suited to the loads involved with pulling a ground breaking impliment. There is a good thread up in the "build it yourself" forum from a gentelman that just finished building a grader box. He shows some pics of the way his finished product performs on the ground.