My 2 year project Concours-Ninja 1100. Finished!!!

Quite right. It has often been said you never see a motorcycle parked outside a therapist's or psychiatrist's office.

I cannot hear it. If it rides fine, why worry about it? Relax, ride and enjoy the fruits of your labours.

Have you considered using a different oil before replacing clutch and springs? Not saying you don't need those parts, but sometimes switching oils has been known to fix a slipping clutch.

Yes, all bets are off when an engine is modded to output more HP. Definitely advisable to upgrade clutch under those circumstances.

On stock bikes I have had great success with using correct oils and /or deglazing the clutch plates providing that the clutch springs and plates are still within their service limits.

Of course this assumes "normal" use which would not include frequent wheelies or drag racing starts etc.