Got my smurf to S. Not sure if I'm continuing it. Took 46 hrs of Ranked to get too. Almost exclusively with chargers - first with a splat charger since didn't have the money or the level. Then Splatterscope, Kelp Splatterscope and E-Liter. Switched between the latter two depending on the mode and on the map. Until A+ I played all the maps and all the modes which is probably why I got stuck in A for so long. C ranks were really fun and weird. B went by without recollections and so did A-. Then in A I got hindered by multiple dc's by my team members and matchmaking which kept putting me 7 times in row together with two or three no-good chargers.
Only A 50 to A+ 30 was done with .96 Deco when I got (salty) tired of expecting team support in the A lobbies.
Chargers didn't appear until in A ranks. Before that there rarely were any against me.
Also, my opinion is after doing it again, that Ranked may measure some skill but it also has got a huge luck aspect to it. Because of that, I'm not sure yet if I continue forward. I don't feel like it.
Thanks to Goya for pointing me the obvious! Splat Zones.