the eazest diaphram I have ever used is made by prefection calls.the blue color is the one I use and it works great for "Me"

the fighting purrs: you can get a box call that is called the fighting purr. it is two push pin calls together in one box. you use them with two fingers and it sounds like two birds fighting.
I have had it work 3 or 4 times when nothing else would work.it sometimes will make a gobbler gobble.they will also come to watch the fight and gives you a chance.

the mouth calls takes a lot of pratice,just keep trying. if you get one that works,stick with it and forget the others.as for the spit.you are blowning to hard.