A #55 pilot is pretty big....you really shouldn't need that big of a pilot with a stock airbox and stock exhaust.
If the bike runs good at 1/2 throttle and above....the main jet is not the issue.
If the hesitation occurs as you open the throttle a small amount, but goes away when you add more throttle - you likely need to raise the slide needle.
And, the way the bike runs can change a bit with weather - but if the bike suddenly made a change - the jetting changes may just be compensating for some other problem that has started, like a loose or cracked rubber clamp at the cylinder head, a rubber cap on the old vacuum port that has cracked or fallen off, or a clogged pilot jet or dirty carb.
A #150 main, #50 or 52.5 pilot, and 2 or 3 washers (#4 machine screw size), and remove the air mixture plug and properly adjust (by ear) the idle mixture....and you should get you a good running bike.
The setting on the mixture screw is not done by "counting turns" that worked for somebody else....it needs to be set for your bike when the engine is fully warmed up, and it is set by adjusting the screw and listening.....you need to find the point where the bike idles the smoothest. If the setting ends up being less than 1.5 turns out - your pilot jet is too big. If your best setting is more than 2.5 turns out....you need a bigger pilot jet. To make this adjustment you need to drop the idle speed down a bit lower than is recommended - but with a high idle speed the slide is starting to open and will allow fuel to flow out the needle jet....and this will prevent you from getting a proper adjustment of the idle fuel screw. When the adjustment is done you can set the idle speed back up.....and do the adjustment while you are sitting on the bike and holding it off the sidestand.....long idle times on the sidestand can starve the exhaust cam lobe and rocker to wear.
https://www.youtube.com/watch?v=YxpQjDQzX7ghttps://www.youtube.com/watch?v=zm5mB3R8Ucw
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