my teenage son has been doing some hobby farming on a couple acres.he has a wd and a three bottom fourteen inch plow and he cant get the plow to go into the ground more than an inch or two. his first plow had shares that were flat on the bottom. they dont look correct. we ran across another plow and bought it. this one has ac shares with the hog nose tips . same problem. we have the ac book on it , and we set the depth adjustment down the whole way on both of the plows.we made sure that the hyd pump is set up correctly according to the book. we made sure that the lift cylinders were not bottoming out. we even tried strapping an old wc engine block on top for weight. no change.the plow is tilted to one side a little so it sits level when the one tire is in the furrow, like the book shows. frustrated. what are we overlooking?any tips are appreciated.