Visually or audibly set the slide. If you back the idle out and gently lift and drop the slide you'll hear the slide bottom against the carb vs bottoming against the plastic idle screw. From there tweak it just a tad till it's only just open. Or.. have a look down the intake of the carb and set it so there is a mm or two just showing under the slide. That is all it needs to idle (IF everything else is correct).
A 42 pilot and J diameter isn't that different to a 40 pilot and a W diameter, and you also established that moving leaner on the pilot doesn't work.
I would be running a 42 pilot and W diameter.. or even a 45 and working with the air screw between at 1.5 turns (or about a quarter turn each side of).
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