I and NWRider had 36mm PWKs on our 06/07 models, no bog whatsoever(when jetted properly), but you do lose a smidgen of top end. Pulls hard all the way through but it makes the gears feel shorter
I hate to see so many people complain about a bike that is amazing once set up! All flag waving aside the bike is plain and simple HARD to jet, it doesn't matter what carb you have on it, you are going to make changes on it regularly, personally this is where I think the flaw is. My 07 ran crappy with the TMX no matter what jets were in it. My 09 has ripped from day one, 125 form and 144 form, TMX or PWK,(no aftermarket pipes not evn the updated ones). With the proper power valves, and linkage setting you should have NO bog, if you do, it is jetting related period. Granted there are other things that could cause this but with a new bike, they shouldn't even be considered.
I am no expert, maybe there really is a machining flaw, or maybe it's the new port setup??? but when people complain about a bike that can be had for 3.5k new vs. 6k for a comparable bike from another brand, just maybe you got what you payed for.

I know I did and I am laughing all the way to the bank

I am not going to name any brands, but I know of people who spent 8k and are having nothing but problems with the bike and getting parts.
Bottom line...double check you have the updated power valves and linkage setting, and take some time to jet the damn thing properly. Beyond that, I am at a loss, maybe I am too blind to see it, but this bike just works for me, I am sure I'd like the KTM 150, but I just don't get along with the others I have tried.
This post is in no way intended for the original poster, his bike is new and not quite dialed yet. But for those who have had the bike a while and still complain read on. I also feel like making to many changes at once on these bikes is futile, you'll be chasing your tail. PS my closest dealer(that actually carries the bikes) is about 12 hours away.