Ya my 2013 562xp had hot start issues on very warm days too. I opened up the muffler quite a bit, put reflective aluminum tape between carb and cylinder, and cut vent hole in top cover. Haven't ran it in uber scorching temps lately but so far so good.
Last software updates seemed to change the startup method completely. I never use high idle on hot saw re-start anymore. Just pull and go. Also on cold start, I never pull more than 4 times before taking off choke, even if no pop! (thanks to weimedog for these tips)