812 Farmer, I can't say what presure works best, I can only tell you what we use with our equipment. Our Bobcat 722 has a 1700# tip cap, a 1200# lift cap. The Oc 46 has around a 2000# cap lift.
The 706 I can't say what either the lift or tip cap is on it,never took the time to find out.
We found out with both Bobcat and dozer on bigger trees, if you go around it with the digger to loosen the soil and cut a root ball type base to the tree, it helps for transplanting of them. For getting rid of small stumps and trees, just break the soil out in front of the stump/tree and go to the back of the stump/tree sink the digger usually pops right out.Those trees were not for transplanting,just removal. We've done some Oak-alot of Popple and others up to 8-10 inch at the base.
Like you could see, for us it is handy for ditch,trench digging, or in warmer climates, water line burial.Hope this helps.