I also didn't play much this splatfest, although I was on Team Rock sooooooo.
Also, I don't know what's so bad about the Aerospray RG, at least for turf war. It doesn't have much range, sure, but it makes up for that in speed. My method has always been fast on the offensive, quick swim speed so you can quickly make ground and get away from opponents. For Ranked Battles, you need something with a bit more power, but for turf war, it's good. My strategy is really based on my gear as much as my loadout, something that lets me get around quick and unnoticed does the job well. Also I'll just say, I hate charged weapons, even now with motion controls I just don't get along with them. They're good for ranked battles, sure, but that's not the mode in splatfest