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I assume you have in-line filtre? So we can rule out carb-inlets as source of crud.
Which leaves carb-outlets as cause of issues. How large is vent for atmospheric pressure? It only needs to be only so large to pressurise float-bowls. If you've got giant 10mm vent, maybe constrict it down to 2-3mm?
This will prevent rapid petrol evaporation inside carbs themselves to prevent deposits and clogs.
Are you using PEA-based fuel-system cleaner in tank? Helps prevents petrol degradation and clog build-up. Darn, I'm starting to sound like one of those hair-product ad-verts!!
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