How deep do you guys generally sub soil? I am running 5 shanks about 14 inches +/-. The 4640 seems to have plenty of power but the traction is the limiting factor at 5.5 mph. Home made subsoiler so no making fun. GRIN. Any input would be great. First time using one.

Edit. It does have gauge wheels, they run up almost even with the duals. You can see the one on the far side, barely.