Definitely one of the better tractor builds Vladimir. Congratulations.
Back home, plows have fallen out of favor because they don't perform well in rocky ground. I am no plow expert, but if your mouldboards are rusty, could you buff them with a wire wheel? I recall a neighbour back home that greased his moldboards after fall plowing to prevent the heavy clay soil from sticking. One other thing, does anyone over there use a coulter? Counters are vertical discs set up to slice the sod before the share comes along to cut the sod off, and the mouldboard turns it over.
I don't want to take anything away from a brilliant build, but I am curious....