Take this advice from an S ranked player: Make sure you have the right abilities first. The ink saver abilities are good since it's a huge ink guzzler and ink recovery up could come in handy too. I recommend pro, so here are my suggestions for this weapon: You'll need to build precision, but it's pretty accurate and has good range. Use sub a decent amount too, since it's good to spot enemies. Inkzooka is great, and abilities regarding specials in general are good, although I think special duration up is the best. I think
is excellent for this weapon since there's a high likelyhood of special duration up, plus ink saver main really compliments the weapon!
Aside from that, I'd suggest playing somewhat cautiously. Take advantage of your range, it's easy to get killed if you go in too deep. I USED to play this weapon on my old account with the mindset "this weapon is super good because it was expensive and was unlocked at level 20", but I don't play it really anymore because I personally think the fire rate is trashy, especially for a 3-hit kill, plus it's slow in the turf covering department. I still have solid experience with this weapon in the past though. Hope this helps! ^-^
Also, good luck with getting to S. It's kinda brutal how approaching the high A+, a win is +8 but a loss is -12, but you'll get there.