I think the idle mix and pilot jetting is still off. The light adds more load on the engine and makes it more likely to stall. Once you fix the jetting the problem should go away. If it ran better going from 42 to a 40 then maybe try the next size smaller pilot.
That being said it 40 seems lean to me. Maybe check your float height as it may be high. Does it leak fuel on the ground when you tip it off center?
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