Unfortunately the only finish we have coming in leftie is satin chrome. This should still be a solid finish in sunnier climates as the same finish is used in the MP ranges.
As for the grinds the
S grind has the least heel-toe relief which is probably best for fuller shots where you aren't manipulating the clubface too much. The
C grind is the same as you see in the T20 range with strong heel-toe relief giving you a lot of versatility around the green. The new
X grind is a more extreme grind and the most heel-toe grind along with the lowest bounce. I would say that is the model with maximum versatility and the least help from the sole of the club. You also didn't mention the
D-grind which sits nicely between the S and C.
I'm not sure what you have in the bag at the moment but I will be going
50 degree S grind,
56 degree C grind and
60 degree X grind. This is worth a read if you want any more info
https://mizunogolf.com/uk/golf-clubs/t-series/t-22/