Bents your posture starts with the torso and upward of it being bent forward and it stays that way and your bum is sticking out away from the basket. You should start the putt with the bum pointing away from the target and as the arm moves forward so should the pelvis so that your posture is straight up when the disc leaves. Think of a heavy rock musician displaying their jiggly bits. That's what you do toward the basket jam your wiener at the pole
Your list sounds good and your experiment with physics is approved by Sir Isaac Newton and for the explanation as to what goes on there google Newtons law. There are more than one and knowing each of them helps in disc golf.
I agree with Mark that is good to try out new styles. Most try something out and if it does not work immediately they'll drop it. Switching styles can take a while and you can practice the new and the old time simultaneously so you'll always have a back up form to fall back to. A better form will absolutely transform poor putting. The yardstick to when to start a search for a new form should be your score card. If you miss a lot or are otherwise losing to people you don't want to lose to because of putting the form needs to change if a lot of practice with the old style does not produce improvements. No improvements despite a lot of practice means either you have reached the limits of the form or your execution of that form is off. To check for the latter remember that all the best putters in the world accelerate the arm hard and often in a very short distance of a few inches only. Maybe as little as 2" of fast acceleration.
The other underlying key is to accelerate as fast as you can meaning optimizing how your body can accelerate optimally. Which is with as loose arm as possible without losing the angles of the disc. So try yawning shaking the arms and raising the arms up and dropping the arms low with gravity alone. You should be as loose or looser in the muscles as they are when you wake up. That is the comparison minus the minor tension needed to just keep the disc oriented correctly. Flat for spin putters at shorter ranges and a minimal anny at long ranges. A degree to few based on the distance and fade characteristics of the disc. I'm not a fan of hard fading putters so ideally the anny should be very small and the disc mildly fading so that it will stay on the line all the time.
Mark Ellis: How fast do you accelerate your arm and is there any muscle tension in your arm before and during the putt? What happens when you move to a thin putter like the APX and the Magnet vs your trusted Rattler? It is way easier to accelerate the arm when you are totally loose in the arm muscles and it is in turn helped by having a thinner disc in your hand. Wrist snap is not even necessary but it is good in small movements say 2" or less for a spin putt.
One of the best putters of all time Cam Todd won't move his wrist at all. While snapping the wrist a little adds power (and accuracy due to added acceleration=better disc weight pushing against the finger=more feedback to aim with) so that you can take some off elsewhere for more accuracy and consistency the wrist needs to stay in control needing more arm muscles to last an event. You'll lose the timing of movements when you're tired and spin putts hurt more for that than pitch putts.
The larger the movement of the wrist snap in a spin putt the better the chance of a mistake is. If you snap slower than normal you'll miss right, too fast misses left and if you're tired and the wrist acts like a ball bearing flapping the hand right without resistance you'll miss wide right. If you need or want to use wrist snap less is definitely more inside the circle.
The only time the wrist should really work hard and have a larger motion range is going for it around your maximum putting distance. There is a crucial difference between the wrist snapping hard vs firmly and still almost as fast. Fast adds accuracy and consistency 100 % murders accuracy and consistency doubly so. 70-80 % power wrist snap is probably ok and when you have a good wrist 90 % should work too but never 100 % within the circle if you don't face monster headwinds and you have to force the disc into the basket on a laser line risking missing long and faaar.
Flat shots need running on the center line of the tee and planting each step on the center line. Anhyzer needs running from rear right to front left with the plant step hitting the ground to the left of the line you're running on. Hyzer is the mirror of that.