25" factory heavy barrel with 1-10 twist, and am using 75gr bthp's and 100 gr ballistic tips.
That does seem slow. 25" barrel should be plenty long enough to get the advertised MV's, especially with 100 grainers and lighter.
You may just have a slightly "loose" barrel, and not actually getting/running the pressure that would normally occur with a tighter barrel. You could certainly increase the powder charge in 1/2 grn increments until you see pressure signs and then chrono that load. But if you're really happy with the accuracy where it's at, there's nothing wrong with that.
Either bullet will take care of a coyote nicely, even if it's not at the speed the books say. I shot my old 220 Swift about 300'/sec under max for most of it's life, accuracy was superb that way, and no varmint or predator within 400 yds was safe; unless I just plain missed.