This loadout gains special pretty quickly, you'll have your special ready when you reach the zone. Use splashdown to control the area rather than getting kills. Sometimes you have chances to finish your enemy if their close, or add one more brella hit to splat them. You'll never be able to finish a splashdown when your brella's broken and you are not full health in rank X. Super jump splash down is also a good choice.
This weapon is strong against shooters and short-range weapons. Try not to confront heavy weapons but painting their turf. Retreat when brella's close to broken. You can always try assisting teammates to recover your brella health.
Place ink mines in or at the entrance to the zones. The 45 damage is good to splat enemy with just 2 hits. Keep painting the zone with your brella on and ink mines placed. This will make your enemy hard to control the zone when you're not splatted. Guide your enemy close to your teammates to let them help splatting your enemy.