stevef:
The top edge of most loaders need some reinforcement for hooks. Consider welding a 3 x 3 x 3/8 piece of angle along the entire top of your bucket, then add three 3/8 hooks. It needs only six welds about 3" long each. Paint the entire top and bottom of angle, grind paint off at the weld locations, weld, then touch up paint.
Consider using three 3/8" hooks. One center, and others at each end, 6" from end.
Consider using 5/16 grade 70 chain. You probably won't break it with an M9000. I can't break 1/4" GR70 with my
M6800. Smaller chain thet is GR70 is usually stronger than the next size larger GR43, and is much easier to handle. 1/4" GR70 is my favorite chain and wll fit in the 3/8 hooks.
Consider that if you use 1/2" chain instead of hooks you will always have to use some very expensive and heavy chain. Can you put 1/4" chain hooks onto 1/2" chain?
The hooks on the loader frame are good. Been there, no regrets. My two FEL frame hooks attach to a square tube that is part of the bobtach type FEL quick tatch. No fear of twisting the frame, just use two pieces of chain and lift at both hooks. This also makes the load more stable. Keep in mind that the bucket edge pushes the load outward, away from the tractor. When you pick yup eith the frame mounted hooks your load will be closer to your grill gurad and could end up on your hood.
Add some chain boxes like these. (photo) Chain is always at my fingertips as I get off the tractor.
You will love your M9000. My
M6800 has been tops.