I hate deathblows with magnum springs myself. I used them heavily one winter mistakenly thinking they were a decent lock with ny system. I was wrong. The coyotes took too long to expire as evidenced by much brush destruction at the set, many entangled animals (otherwise un-necessarily), much time spent repairing locations for reset.
I dislike it when coyotes entangle when often there is no need for them to, as in having coyotes all spun up on brush when they should have been blasted dead.
The teeth are prone to damage, the heart of the lock.
Trigger7 mm you said you are using them with compression springs. Did you really mean that? A compression spring is the wire coily style spring as an Amberg style spring. Stinger springs and Magnum Stingers are torsion springs.
It is always pertinent to define terms in a discussion. We are happy with exactly what? One guy is happy because his coyote is caught and held even if entangled and significant swelling, regardless of location damage while the next guy is only happy when the coyote is laying flat out dead from a carotid artery occulusion death even if it is caught low neck.