I can assure you that the colour match is fine, and that is just the lighting.
Can you feel any vibration through the wheel?
Could be wheel balance, alignment or bearings
May well be alignment though. Have you checked he pressures too? They could just be noisy tyres but having them all pointing in the same direction helps
Flywheel wouldn't make a noise in conjunction with road speed - it's attached to the engine!
Setyres do have hunter equipment - the Brighton and Hove one certainly does - which I think is his nearest
The Worthing seafront one? Or is there one near the Brooklands industrial estate? Yeah I took the Evo to the Brighton one when I lived nearby, although unfortunately it didn't (and still doesn't) have enough camber adjustment, so it sits at 2 degrees which is killing my tyres
Looks like it should be 5W40. The manual should tell you the correct grade.