Is your saw stock, and how old is it? I got one in August (though it was a mid-2015 mfg saw), and it ran great, but the only issue I had with it is that it was before the new cover with the hole in it, it would vapor lock above 90F on warm restart. So, I talked to Husq CS and they had me take it to my dealer, and they put the new software on it and the new cover under warranty. It has only run premix fuel, so they were very, very helpful about any issues! Anyway, I got it back from the dealer, and it had a little bit of a bog/stumble at middle throttle openings, but idled and ran WOT just fine. Over the next couple tanks, the bog got bad enough that I was pretty sure there was some vacuum leak, even though it idled and ran WOT OK. Anyway, I called the second level tech folks at Husq USA, to ask if they had to make the transition lean or something for emissions, or if there was some issue with the latest software, and he said no, sounds like a vacuum leak to him, too. They literally just sent me a brand new one (showed up yesterday 2016-25xxxxxx) with all the updates, and even included a felt air filter, as well as the mesh one in the saw. They're sending a call tag for me to send my old one back. I seriously couldn't be happier with the CS!
Having said that, I'm just a firewood hack, and I've got the 4 year warranty, so I'm running premix in this, and keeping it stock for now. I know not everybody can or wants to do that, based on how much they run a saw.
Mike