After playing for a bit I've found a strategy that I usually stick to when playing Splattershot and Splattershot Jr. I usually stick with jumping, spraying in front of me, then diving back into the ink and repeat it. I find it useful at the beginning of matches since I can cover decent ground while still maintaining decent speed. Same thing with combat, though I usually use jumps to strafe more often in those situations.
Whenever I try to push into enemy territory (like, say, on Urchin's Underpass) I chuck some Splat grenades or whatever sub-weapon I have on hand to make crossing into those areas a little safer. I'm still trying to figure out more stage dependent strategies but I might need more time to figure those out.

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