I think the tulle buffer is working -- have seen multiple cabbage moths, none landed/laid

Fingers crossed, but so far it seems to be good in terms of success by making sure the target plants aren't touching the tulle.  The moths flutter and flutter, and circle and circle, but haven't been landing (at least, from what I've seen).

I do think that one oddball caterpillar a few weeks ago must have been one who spent the winter there somehow.