It will be a while before I have much to report, but I'll post something when I have things sorted out. Today I took the 10-tined, 7 ft cultivator out just to see what I could do with it: I got no traction. Soil is still moist, and as noted in your other thread I would need at least 50hp to pull such a big plow. I intend to remove 5 of the tines and use 5 when things are a little drier so I can get more traction. I soaked them all with penetrant tonight and will slowly work on getting the bolts loose.
I've got tons of earthworms in the area, which I do not want to kill off, or I might try the grub treatment route.