I'm an octobrush main too, I'll share my set with you and explain it
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Squidstar Waistcoat:
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First, I use ink res since you need to get close to people to attack with the octobrush, which means you will end up in enemy ink a lot, so this helps.
Cold blooded I use since octobrush is a stealthy weapon, and ninja squid is obsolete with this, since it slows down the kraken, so cold blooded is what I use
I use swim speed up just because it always is helpful to me able to move faster, and you shouldn't ever be running with octobrush (if you are holding the brush out and painting the floor with it like that, it's fine when you need too, but run speed up doesn't affect that)
Finally, I use the 2 attack since it negates most peoples defense up, so you will always get a 3 hit kill, and it let's you 2 hit them if you hit them at the "critical angle"