Okay. The fact the saddle throws you forward sounds like a balance issue to me which was why I asked about the rocking. Though the horse looks fairly level withers to croup (nice horse, BTW) if you look at your side-on pic you can see more back-slope towards the withers which tends to make the saddle pommel drop (as the back drops) under load. You end up leaning back to keep your balance and the saddle tends to move forward until it's tight behind the horse's shoulder.
If it were me I'd strip the old flocking out and rebuild the panel trying to take this into account. It's often the case that a saddle which seems a perfectly good fit when the horse stands still is not so good with a rider up :(
Don't know if any of this makes sense to you, and obviously it may be completely wrong. Really it's impossible to be accurate like this, particularly with what appears to be such difficult-to-see-what's-going-on problem :)
And if Kieffer saddles have only one spot where you MUST sit, why don't they tell you where it is? Is it a secret or something? ;)