>>Payload is 26 starlink v3 satellites.

>F9 fits how many?

Zero. Starlink v3 is too big for the F9 payload fairing. It's not just a matter of mass, the diameter and overall volume is important as well. In terms of performance, last I read they're supposed to add 1 Tbps of capacity each, so assuming they all work the first time all 26 would be around 10x the network addition of a full F9 v2 Mini launch. But the larger antennas would have other advantages beyond sheer bandwidth, and they'll be able to start getting more serious about direct to cell.

29 v2 satellites (around 4 times lighter than v3)

I think somebody on the livestream said 60x capacity over Falcon.