Eh, how is "North should have advanced 1
♥" an option? With 12 points?
2
♣ may or may not be the right bid but with "few agreements" you've got to shoulder at least some of the blame when you choose it and it doesn't work out.
Meanwhile, were the opps playing Acol or something? If opps are playing some sort of strong NT, 5-card major system there is really no reason at all to be fussy about your club stopper, Ax is more than sufficient.
It seems both partners set out to make the auction as difficult as possible, and both succeeded. No blame, only praise for achieving your goals.
"One of the painful things about our time is that those who feel certainty are stupid, and those with any imagination and understanding are filled with doubt and indecision"
-- Bertrand Russell