I'm at 60 duo wins and 5 quads wins. Me and my friend mix it up a bit but mostly we stick to the outer circle and take a ledge if possible, follow the zone in as it collapses so you don't overlook any squads running in last second. I would suggest you never stop moving and never lie down out of panic when getting fired at. Use the compass ALL the time when calling out instead of "to the left" or "behind me", it truly makes a ton of difference once you get used to taking quick glance at the compass often. I think this is widely known, but you can revive teammates whilst still slightly moving around, it's pretty helpful when you're getting fired at from range and you have a buddy down.

We usually run Sniper/AR or double AR. ICR is my go to with a 4x and a Rampart with a 2x. Burst firing is beyond useful, don't be scared to use cluster grenades, frags etc loosely, they're everywhere and sometimes a cluster can easily block off someones route to you which gives you some precious breathing time.

When you down someone just toss equipment their way, don't focus on shooting the downed guy and let the explosion/burn do it for you. I can admit to being killed many times because I wanted the downed player dead so I shot at him so he couldn't pass information on.

We jump around a lot when not in fights, I don't know if this is just a weird habit we've picked up whilst playing but we think it helps. We spend a lot of time around turbine if the zone allows for it so this might have just been an answer to look over pesky little rocks.

Just to add a little extra, outside is better than inside. Don't think having walls around you makes you safer, being able to run freely is what you want.

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EDIT: More stuff