I think it's commonly accepted, maybe even "known," that Strength and Vertical aid in dunking. And I have the same strong impression as you: Ruby didn't dunk, Diamond dunks a lot...and amidst traffic, even posterizes.
To the point where I think Relentless is now mandatory and maybe even Posterizer.
Which makes the choice pretty tough. I'm thinking:
1. Rim Protector
2. Relentless Finisher
3. Posterizer
4. Bruiser
5. Dreamlike Up & Under
6. Brick Wall or Post Spin Tech or DRD or Limitless
Yeah, I think one of the biggest questions with regard to Tendencies, is if a high tendency for, say, Tear Dropper, means that one will complete at higher %.
I think maybe one way to test it as scientifically as possible would be to do the testing with user timing turned off, and let player rating be determinant of shot success. See if there is a consistent and appreciable difference in completion % across a very large number of samples.
EDIT: And Post Fade Left/Right not for left vs. right, but for Post Fades in general is of interest with this new PD Wade. He has elite-for-a-guard 92 Post Fade but ultra-low Post Fade Left/Right Tendencies of 10/15.
Curry has 25/30.
Very clearly an error, but I wonder how consequential it may or may not be.