That is very funny... I opened 1NT as well the bidding went:
1NT 2♦ (1s im MAJ) X 2♠ (p/C)
I passed, Partner bid 3♣. Now I decided to bid 3NT anyway. After a ♦ lead partner was furious (at least in his way)
Is there any investigation about these gestures during the bidding? This might be a good argument, that there IS a forbidden communication code if there is nothing of this at all...
dont see a reason for blackwooding here. And I see no way to find the neccessarities for a grand. small slam might in very rare cases but I will not judge like a 'weichei' :)