Well, if you arent having issues, why use a high mileage oil?
I wouldnt in a motorcycle just for the simple fact it has other additives in it that could affect the wet clutch, besides being energy conserving.
The older an engine gets, its usually advised to run a thicker oil for consumption issues...but if yours aint usin it, run what the factory recommends.
Or, if you must use 5w30, make sure its not energy conserving, and stick to regular oil, not high mileage or synthetic (every synthetic Ive ever seen in 5w30 is EC).
I personally like either Shell Rotella T or Mobil 1 TDT oil in 5W40.
I used to use Mobil 1 10W40 4T but two quarts of it cost as much as 4 of the others, and it doesnt have any significant attributes to be worth the cost to me.