The mix scres aren't master screws, they adjust the idle circuit. They do have a bit of an effect on other parts, but no more than everything else does. So no adjustoing them to try to adjust the top end!
Jets shouldn't be essential for your bike. While I had it open I'd want to go up one size anyway, but it's not going to be vital.
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"We are the angry mob,
we read the papers every day
We like what we like, we hate what we hate
But we're oh so easily swayed"
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