Whatever you do when changing carb settings, is do only do to ONE THING AT A TIME.
That way you can always go back when and if things arnt working. Only change the needle one setting at a time too.
I guess I dont have to tell you that you shouldnt even go near your carbs until your certain that the valve clearances are correct, the air filter is clean, spark is good and reliable and your bike is in general good condition.
Taking the baffle out the exhaust will make it leaner yes.
The jet sizes effect the mixture at all throttle positions ranges. If your bike idles fine and will pull ok from closed throtle then leave the pilot jet alone. It its seriously bogging down on half open throttle then you could experiment with a smaller main jet or try dropping the needle.
Be very careful when leaning a bike out though. If you go too lean you will cook the plug and the top end.
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Did some trips.
Rode some bikes.
Fix them for a living.
Can't say anymore.
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