My major breakthrough was simply learning how to stop the elbow! This has taken a lot of work. I have been practicing for the past week or two now every morning except one(around 1 1/2 hours each session). I have let my rounds with family go to crap, but not anymore!
Note: this is without ANY aid from my arm besides guiding it to the right positions.
It finally clicked. The motions I guide my arm through are: Pretend like I am trying to saw my torso in half with the disc. That keeps the disc close. Then I go into the "nudge one of my buddies with my elbow to look at a nice lady". Or trying to jab someone in the eye with your elbow.

And making sure I don't start turning my shoulder. That keeps everything in a straight line and stops the elbow(eureka). Now lookie here I am at the right pec drill! At that point there is no stopping it. My forearm whips out so effortlessly YET fast as hell. Like you have written JHern I couldn't add arm speed then if I wanted to! The kinetic chain was linked to the disc.
I am hitting almost 300' from a standstill with just torso power. Stopping the elbow is the hardest thing, but once I got it - wow. The craziest thing I noticed is the speed of the disc towards the end of its flight. It looks slow but you can still tell it is penetrating the air.
Once I felt comfortable with the concept by doing at least 50 or so throws. I gave myself a treat. I took two wraiths. I threw one forehand which I can hit 350' feet easy with, and it was a beautiful flex shot. Then I did a bh incorporating a walking x-step - went through the same motions I did before, and I was within 20 feet of my forehand throw. That is unheard of for me. I don't know an exact distance, but it was over 300 and an unprecedented distance for me throwing bh without a hill.
I think that's it. Whew good day. It's all paying off. Thanks to everyone on here I've still got a ton to learn, but this is my biggest achievement!