If the herd is increasing in VF that means that stress is not limiting the population ,even if it has a negative effect on the rate of growth. VF shows that even at 200 DPSM stress is so insignificant that it doesn't prevent the population from increasing. Yet you think stress is an issue worth addressing in our hunted herd where no WMU has a DD of over 30 DPSM and some as as low as 8 DPSM .