So after multiple attempts removing and refitting the carburettors for road tuning I've found a pretty spot on tune. The engine is smooth throughout the entire rev range while maintaining the top speed and regaining the torque it lost from the rich jetting.
Main jets: 112, 110, 110, 112
Pilot screws: 2-1/8 turns
Stock airbox and filter with the restrictor plate removed, running the standard bellmouths (short, tall, tall, short).
Thanks to Sam Moore for his advice on jetting and tuning.