As you have the plough stripped so far, remove the furrow beam and check it has not pulled down in the front leg fixing area, they are prone to this, and it makes any attempt at pitch adjustment pointless, we had the one in Don Williams high cut plough( now looking for a new owner) pressed straight by a local steam engine restorer.
Just built my self up a no9 made one hopefully good one out of two, both ploughs the furrow bean was bent down, but nothing a 50 ton press couldn’t sort.