Jsb.. Either you misunderstood/misinterpreted my post or I typed something wrong there.
1. I did not say they affect the stamina.. I am not sure about it either.. But, since spin-steal is only most effective at dying moments, stamina doesn't matter. Because it gets equalized with the opponent anyway.
2. MFs and MF-Hs reduce a beyblade's moment of inertia(take a look at Physics topic to get a rough idea) so it is easier to OS the opponent in the last few seconds if he is on MF-H. And this is true for the greater part of my tests.
3. Basalt's wins are more due to its force smash and recoil-KO ability and not due to roundedness. The round sides do help though. Since duo does not have the recoil-KO ability(from what I saw.. Not too sure there), it cant KO spin stealers like Basalt. And yeah, an aggressive Gravity of mine almost KOed BS5's Duo so.... But it could have been a luck factor.. And again, Duo is weak on the underside.. And yeah... Duo is easier to KO on WD...
4. Diablo maybe a threat yes... But since it has a low stamina itself, it can still be outspun relatively easier than Basalt. And yes, low recoil is a problem due to the inability to get recoil-KOs.
5. The wobbler can devastate Low track ones but I havent yet seen it in action so I cant conclude anything right now about it.