Are night time sets similar to day sets regarding how long you stay there? After a night kill, do you move to a different area?
I spent 3 hours in 1 spot and killed 8 coyotes.
Were you calling constantly for 3 hours? Killing 8 coyotes in one spot while calling for 3 hours would be unusual.
Although I have killed 4 and 1 bobcat in one spot but that only took 17 minutes.
If I remember correctly folks who keep up with that sorta thing say odds go down each minute after eight minute mark as far as calling coyotes is concerned.
I would also add for benefit of OP that going calling with the wind at 30 mph is not advised. As you found the sound cannot travel upwind very far so most animals are going to only hear it downwind and coyotes will smell you and not show themselves and you are just educating and making your future calling tougher. Bobcats don’t pay attention to smell so that worked out for you. Now if you are in a contest you just have to deal with it but for recreational calling I would never screw up good calling ground by calling in winds above about 15 mph.