Question Author
daagg, if it's any consolation, even though I started the thread my sequence of events was very similar to yours. The pdm, such as it was, didn't occur to me till I'd filled the grid. And at the risk of being trite, I do think one's enjoyment of a puzzle is correlated in part with how late the pdm arrives. So early discovery is one of the crosses that geniuses like midazolam and dr b must bear.
As for clueless joe, I am amazed that on the strength of some comments on here you would not bother to resolve the puzzle completely, content, presumably, that it won't alter the end result.