I hesitate to post this (based on recent response to queries about missed slam hands) but would be interested on bidding thoughts, and this seems a reasonable one . I have decided South's 3NT may not be advisable and 1D followed by a forcing auction may be better. But would not North consider a slam opposite a 3NT bid. North is strong enough for strong NT in terms of points, not shape. Surely gives enough for a quantitative bid or even investigation of club. Again maybe south's 3NT gets in the way. I have read some advice that a jump to 3NT should be avoided if possible. Note 3NT should have the note 13-16??, not 13+ in my diagram (which maybe is the problem undervaluing S)
regards P
Edit. I know LTC is only for suit fits, but just as an observation N has only 4 losers with a beautiful club suit and distribution, 17+ points. S has 7 losers and has indicated 13-15/6? points. At the top end that is close enough to explore NT or Club slam? Obviously on a strict 33 it would not be bid but ...............