Possible issue or just paranoid?

[limax2]

It sounds to me like the carbs could do with balancing. I presume you are talking about how hot the pipes are getting with the engine at tickover. In which case it would indicate that 3 and 4 are doing most of the work with 1 and 2 not contributing their share. Carb balancing will probably sort it and you will probably notice an improvement in low speed responce/smoothness as well.