It also depends a bit on print size. I develop longer for a 16x20 than I do for an 11x14, because of the fine detail that starts to appear when the prints are bigger. That micro detail appears to almost lower overall contrast (it doesn't actually do that), but to counteract that impression I leave it in for a bit longer. That is way easier than to give 1/2 grade more contrast.
After reading all of the above I'm keen to try LPD undiluted.