Are you adjusting the chain correctly? Looking at my chain I'd have been tempted to tighten it up a bit until I got the ruler out and measured the slack,within what's recommended. Compared to my blade the chain is "loose" but that's the way it's supposed to be.
In that case I'd go for a DID zvm-x all gold chain,hollow joining links so easy enough to do yourself.
Might just get one for myself while the sprockets are new.
The standard OEM chain size for the 2015/16 model is 120 links / 525 pitch. You can't really go wrong with chains from any of the top brands like D.I.D, Renthal, Tsubaki to name but a few. Just pick whichever one suits your budget.