Per your question it does not seem like it is a jetting issue. If off the line your motor is either strong or bogs it sounds like you are having a fuel issue. If it was just bogging everytime I would say you need to adjust your pilot. Besides that not sure I would make sure there are no way your fuel line is getting pinched.
As for the up top issues again you are saying it is sometimes strong sometimes not. If that is what you are saying I think you might have a fuel issue. Could be that your sucking so much gas your lines can't keep up. Do you have a dual feed petcock? I am not sure besides that.
As for the 200hp 800 that has pipes and carbs I am not sure how you come to that number. I find it really hard to believe that pipes and carb are going to give you over 50hp. The MachZ has the most HP for a stock sled and it has 155hp at track. Are you measuring it at the crank or at the track?
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