40T and Plowing

Tonight I was plowing with our 40T with 3pt plow (2 14" bottom) and I just couldn't get it right. Now I have to admitt it been years since I have plowed but I know that it should run 2nd gear fairly well (did this when I was younger). Anyways, tonight I had to use 1st gear now I know that I have the power since we have done a lot of work on the engine and I never remember it having this much power (it actually will lug way down now as opposed to stall). I figure that it has to be in the adjustments but I am not sure where. I tinkered a bit with it but just can't seem to land on what it should be and since I have some more to do I would like to get it right. Dad, wasn't much help on the adjustment part, it used to be when I was younger he would just look at it mounted on the tractor and tell me it was off. Now for the stupidity part, I never asked him questions about it or for that matter paid much attention to how he set it up..... dumb dumb dumb. (You know it is amazing how much you wish you did years ago) Anyways, I am hoping one of you folks who do this more often than I can give me a hand on how to set up this plow and some tips.

Without having a book back in the good ole days - we just set the center link on the 3 point so the plow was running parallel to the ground when plowing - ie front plow at the same depth as the back one. Once you have dropped into a furrow that is the depth that you want to average when plowing turn the crank on the side link so that the plow is running flat on a plane that would be perpendicular to the tractor, ie not tilted right or left.