like i've said before ,,,when i'm tired i don't think too good
since you are already familiar with diaphram calls you should check out the PRIMOS ''DOUBLE HOWLER '' diaphram.
i rarely use the trumpet style howlers since i got a double howler. it's a fine turkey call too. it don't take long to figure out the fawn bawl , distressed rabbit, house cat , coyote pup distress, adult coyote distress and more on the double howler.
remember too that mixing up the calls is recommended and once you made visual on a dog ,most times you can just kiss him, or lipsqueak to get him to come in close enough for the shot.
ALWAYS STOP THE DOG FOR THE SHOT!!! just whistle like you were calling the family dog,,,or bark with your natural voice,,,if that fails give him a long , high pitched howl. but if it has winded you ,,,forget it , they won't generally stop for anything after they catch human scent.
learning to stop the coyote ,and remembering to do so is a vital part of success,,,,,,it must be done before he gets downwind of your setup.