Originally Posted by philbob57

That 90 degree heuristic may work for people of average upper arm and forearm and total arm dimensions, but not for people who don't fit the model. Further, if someone does have average dimensions and a 90 degree angle and feels uncomfortable, should the person stay uncomfortable or ignore the 'rule'?

Core strength can be evaluated in at least one parameter pretty easily. How long can you hold a plank position? A minute or longer - maybe core strength is OK; much less than a minute, probably a weak core.

I thought the rule of thumb was having the bars obscure the front hub while on the hoods, but I ride an old bike with a ROT of bars obscuring the hub while on the drops. If your bars are in front of the hub, I think that's a longer reach than recommended. Also, I think 100 mm is longer than most manufacturers put of frames for people your height.

But I think numb hands say too much weight on your hands. IDK ... I use a quill stem, and changing stme length is a big deal for me. All you need to do is remove and replace 8 allen bolts to try out a shorter stem. Besides, it looks like you've used a shorter stem with success, so I'd recommend trying out a 70-80 mm stem.