Black ink/pen dilemma

I'm seeking a silky-smooth writing experience; smoother and less scratchy/feathery than my Platinum Preppy 03 that has a mix of Levenger Raven Black and Montblanc Black.

This pen will always be filled, ready to write, a dedicated black-ink pen. And since paper is a biiiig factor, my usual papers 📔 are Kokuyo Campus, Rhodia and MiquelRius, with the occasional foray into Cheap Lousy Paper.

The inky candidates:

Levenger Raven Black (pretty much ruled out for Bad Behavior)
Quink Black
Pelikan Black
Waterman Black
Montblanc Black (in the old shoe bottle)
Chesterfield Obsidian
Monteverde Black Ash

Sailor Black carts
Platinum Black carts, an endless supply
Lamy Black (carts) and a Lamy Safari F (this was actually a pleasant combo, I may return to it).

The 🖋 pen candidates:

Nemosine Singularities, F and XF
Platinum Plaisir F
Sailor Sapporo MF
Jinhao Shark (I like these cute little writers)
Wing Sung 601A
Hero 616


Currently filled:

A Pilot Petit with a mix of Levenger Raven and Quink Black. Complete disaster. Bleedyriffic.

That Platinum Preppy with a mix of, yes, you guessed it, Levenger Raven and MB Black. Slightly less of a disaster.

Any thoughts? Experiences with any of the above in combination? Recommendations?

Oh...and I am NOT buying any more black ink, not even carts or samples. Thanks for reading this overlong, overfussy post!