I'm trying to use a subsoiler and cannot get it to go down and stay down. I even hand dug a hole, dropped it in there and after about 20', it's come up to the top of the ground. I'm novice tractor owner and like many, was suprised to discover 3 pt hitches only have gravity fall and no down-pressure. I'm assuming I'm doing something wrong. It seems the angle of the subsoiler tooth should pull it downward, but mine doesn't seem to want to go down, just up. Should I be putting some forward angle or back angle on it by adjusting the top-link? My assumption is it's designed for the shank to be somewhat vertical when in use. Any tips, tricks, or instruction are appreciated. I watched a ton of videos on using subsoilers and 3 pt hitches, but didn't find any that addressed this issue or that were good 'how-to' videos. Thanks!