I know what you mean. Just had my bike at the shop for new tires and the mechanic - a racer that runs a shop so he can race - commented the bike made a strange sound under moderate acceleration and I should try to isolate it. I rode the bike home and didn't notice anything out of the ordinary for me. Then I hit my gravel road - which is in its washboard phase - and thought the bike was coming apart. I got home and went around the bike and there are all sorts of panels that rattle about, plus the GIVI bags. It's just gonna be a noisy bike, but I do love the thing for some reason.
Oh, and my new Mitas E07+'s? They feel massively more secure riding on the gravel road to my house and they feel smooth as a road tire and well planted on pavement. I have no vibration issue at any speed so far. Ok, with tires that are good on everything you ride on, you know there has to be a downside and its noise! The tires scream like a raped ape. The front howls under braking and they both sing at highway speed. Ah well, I guess its the price you pay. I'll just make earplugs part of the routine and they'll help with all the other noises as well. lol Maybe with some wear they will quite down a tad. Fingers crossed.