450' from the knees? Why do we even bother with the rest of our legs? Well, I guess you get another 150' from that.
Folks, I am suddenly fascinated by what you can isolate with the kneeling throw and how it might help us help you. Kim, I think I'm going to say similar things to what you've heard before, but maybe if we just cut your legs off at the knees your body we can get you to take this idea faster. I think (hope) this tracks with what SW is trying to help you fix.
Compare your setup and swing pattern to Sadlowski. You already know you had the spine extension and APT:
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Ok. But notice that Sadlowski actually starts spine neutral or even slight extension as he gets on his knees. But the important part is that just as the camera cuts from the side view to the front view (which is annoying and I couldn't find a better angle), he very briefly gets more
seated toward his heels and relaxes his spine with a bit of flexion/more neutral than you just before he cues up his backswing. You maintain the spine extension. I have a suggestion.
1. Once you get on your knees, focus on (a) relaxing at the lumbar and (b) hinging at the hips and seating back toward your heels just a bit, just like sitting back toward a chair.
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2. Here's the other big thing, and what SW & I keep seeing, I think. When Sadlowski bombs that shot, notice (a) the main direction of the ball, (b) the direction of his hands at ~impact, and (c) the direction of the elbow at impact. This is the same as "swinging upward nose down" in disc golf with his whole posture in a nutshell. Notice (d) how dramatically tilted upward his shoulders are to lead the shot. Instead, your move swings "over the top", and takes the hand, elbow, and shot way to the right. In fact, the trajectory of the disc is crossing the orientation of your shoulders, which means I think you have lost the leverage chain between the shoulder and the disc somewhat. Notice that everything in Sadlowski's swing is "inside" of the shoulders at launch. Doesn't matter your intended trajectory - I'm talking about the overall move.
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Here's what I want you to try. Do this drill two handed with something heavy like a big brick,
but from your knees. I want you to (1) let the brick help force you into less spine extension/relax and sit back like I said above and (2) as you swing back, give your body the feedback to "swing upward nose down" by using your whole body to launch the brick more "forward and up" like loopghost does here.
That is the same exact idea as Sidewinder's Dingle Arm, but with two hands and throwing a brick!
Kim, this is just a fundamentally different move than yours, and I think it's hard for you because of the muscle memory throwing on a more vertical, spinning axis that doesn't have this ultra-efficient pendulum action. Do you need it purely for distance? I mean probably not - you can throw 450'
on your knees, my friend. But it is a source of efficient power and likely consistency. Maybe let the knees teach you something new. If not, then something else!