Two tanks of 93 octane and there's no difference whatsoever in the character of my bike, which is: Sounds like a blue-printed hot rod for the first 10 minutes, then it knocks quite loudly under a light load
It's pretty sad sounding, really.
As someone alluded to, with the woman on the back it's worse because the only way the bike sounds good is ON the gas or OFF....not exactly the way I like to ride with my lady on the back. So, I just sit there right in that zone where the knock is banging away at its loudest. Depressing, but there's no good alternative. Down shift and rev it higher....makes no difference, just more knocks-per-minute. It's related to the load my engine is under, not the RPM so much.

Anyway, back to the octane, makes no difference. Oil makes no difference.

One thing I thought I might try is a colder plug. Could my plugs be retaining too much heat? I know many will say that a colder plug would be begging for SVS, but for God's sake something must be making this thing pre-ignite and it just isn't normal. I've been riding close to 40 years and I've ridden an enormous number of motorcycles (used to work in the industry) and no bike....EVER.....has made this kind of racket when warm.