The needle in the pic is a JD_blue and its a very good needle, probably one of the best.
Which bike is it, model year and which carb? (Keihin 36 or 38).
Assuming its a 300 with a 38 Keihin start with PJ 42, MJ 172, JD_blue clip #2 (as you said its hot). Set AS to 1,75 turns out. Make sure your idle is super low so that the bike stalls from time to time.
High idle settings negatively affect the idle circuit...
edit: seen its a 300/11 Dunno what the factory set up was, so above said is valid for the new models. You could ask JD which MJ he recommends, a 145 seems to lean for my understanding but might work on a 2011.
The needle is worn and that leaves room for assuming that the needle jet may be worn too. You need to check that.
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