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North UK

Do not worry , keep the original carbs, nothing on the market beats genuine mikunis.  And they have more than enough power for a 500cc those carbs even a small GS Suzuki 250E bike.

Right, let’s narrow this down bit by bit.

How good is the sparking ? what happens if you change front and rear coils ?
Fitted fresh CR8E plugs ?  (it is to rule out plug faults too)
Keep HT caps in mind , the oem HT caps are always sketchy.

And what jets (pilots and mains are inside the carb?)

// Meditation doesn't mean you have to sit still....