And also try lowering the dead key some more if possible Matt. Not sure if I already said this or not. But it might only take 1/4-3/4 of a watt to make it work. That or like I said, You have some RF coming back into the amp causing it to go into oscillation. I am not an amp tech or not do I claim to have much knowledge about them, just throwing some things out that might be the issue is all. Again, I hope you get the issue resolved!!