To get volume out of a diaphragm, use an amp horn. They are the most realistic but also the hardest to master. The ELK howler would be a close second for me but they are really the same type of call just blown differently. Jake, I have a diaphragm press, email or pm me and we can work up something. There are a ton of variables. You just need to find the right mix.
In general, you don't have to sound perfect for hunting, just know when to use the right sounds and know where they are. But you probably already know that.