I was doing back of the envelope math and have a sneaking suspicion that the mass ultimately drops out… but it makes sense with my intuition… stuff like gyroscopic flops speed just depends on the rotational inertia… but off plane string hits has the mass drop out and depends mainly on the ratio of mass to rim weight so it feels less stable
Absolutely about the issue of redirection, but side effects dont affect the shape of the profile, so the “extra” tilt due to the extra mass should still be proportional… i think that kinda explains why H just feels more unstable to me… bouncing away is bad, not only you tanked the impulse to stop the yoyo you now have to add the force to bounce it up! The best is to direct the string to the bearing before it stops
Edit: speaking about H shape… the “rationale” never made sense to me (ie being a more extreme weight distribution)… the shortest path from two points is a straight line… so if you want to maximise rim weight V shape does it best (hypoteneuse shorter than two perpendicular line, so less material used) So its the worse of both worlds, less rim weight and worse at directing off plane string hits. I personally love H tho, only for ergo reason tho, i just like how i can fit a finger in it and how well it rolls off.