Easy start means that you don't have to set the purse down before starting,
. I suck at diagnosing problems without being there so I most likely won't be much help. Fortunately many people better suited visit. So hopefully the right help will show. Maybe the best thing for you would be to take the dealer. It's a new Dolmar saw. I would expect at least a decade of reliable service. You just gave it a shakedown run, it is not acceptable as is. Makita will make it right, a good dealer will step up to the plate and bat for YOU. Give them a chance.
Now saying that, to me it seems probable that your saw is running lean. Is it possible that when you went all 200 pound guerrilla something broke in the recoil housing. I've had similar event take out a flywheel side seal, broken starter pawl on a 372. I personally would take the clutch cover and recoil housing off and check to see how free the engine turns over, verifing that there is nothing catching in the clutch or flywheel. Chain brake engaged?,lol.
Seriously if I suspected anything wrong with a brand new saw with a warranty I would be taking advantage of it. It's allready paid for. I adopt saws going to scrap and rebuild them, I also buy new ones. I wouldn't want to repair a warrantied saw myself is all.
Merry Christmass