This is exactly my situation and I do not buy that my PCV has dropped in the past couple of months.
What Y booking class(es) have you been recently travelling in?
It would be really useful if say for one flight we could get data on the seatmap and PCV of each passenger (and reasons why PCV is higher in some than others) etc, so we could get an idea of how issues like these are worked out... surely it wouldn't be too complex, but hey what are the chances of getting access to such information!