This I agree with 100%... I know when I bred my gaboons would copulate when thunderstorms rolled through my area... I do believe it triggers breeding more than feeding... But, I would imagine that some localities would be affected by barometric pressure more so than others as far as feeding goes...
I guess maybe some bloodlines might be stronger feeders than others... My current stock is from Brad Chambers, Brent Bumgardner, and Clarles Shanklin... Like I said, I have had no problem feeders within my hog collections over the years either.