Okay, in my wildest dreams I didn't expect you, Schin, to chime in! Thank you!! I can feel it... I'm going to gush in this message and make a fool out of myself!
I've watched your amazing videos, of course, and so what you're saying is that you wish your grip was palm-down? (Is there an official name given to this type of grip?)
But given how fluid your movement is, and your amazing skill (to my eyes your hand is perfect, and in my distant dreams, I'll become 10% of the calligrapher you are! -- okay, there it is, I'm now embarrassing the heck out of myself! LOL!) do you think there's something in particular you'd gain, today, if you were palm-down? Aren't you essentially proof that a tripod-on-side-of-curled-little-finger grip can work?
Sorry to grill you, but I couldn't miss this chance to ask you that question!
I am holding the oblique palm-down -- it doesn't seem uncomfortable to me, though it's not how I hold a fountain pen, gel, or pencil, and seems like it helps me a bit with pressure control from the tip of the index finger. But I am at the very beginning of Eleanor Winters, so I really should zip it since I have no idea what I'm talking about here! LOL!