Landon, just replied to your PM. Shoot me a pic of your setup if you can and i will see if there's anything that can be changed to help.
Most times that "screeching" noise you hear is the impeller bouncing/vibrating around on the shaft it sits on. And its usually due to no liquid between the two. Most times it due to a big air pocket getting sucked into the pump for some reason. Either you have a bad fitting on the plumbing that allows air to get it....you are very near boiling and are starting to just get bubbles come off the floor of the kettle and get sucked into the pump. Or there could have been an air bubble trapped either in the pump head at startup or in the line feeding the pump and it has worked its way into the pump now.
Most times people call me about that screeching noise when they first buy a new pump and want to test it by plugging it into the wall and make sure it runs without any liquid in it!