I've never shot the 40 ballistic tips. I do have some 40 Varmageddon's that were very accurate, but thought they might be a bit frangible for coyotes. That was in a 26" barrel though and they were clocking in about 3,800 fps. I hear the 40 gr. Sierra hp is a very good bullet for coyotes, but haven't shot them either.
Shooting the 40 v-max in a 16" AR was giving me around 3,400 fps. I do think the harder you push them the more explosive they will be on coyotes, so slowing them a little might give better penetration.
Southeast coast coyotes are right in the heat of heartworm territory, so I'm not surprised. I thought how crazy it was for USFWS to try and establish a wild pack of "so called red wolves" in NE North Carolina smack dab in the center of heartworm and mosquito territory. Typical Bureaucracy at work I guess.