Sad to hear of the fire, I saw on your other post the difference opinions of those who have ridden the 1100. My take is that maybe your bike did have an issue. It could also be your riding style. Do you ride with a relaxed grip? Normally, elbows are bent and your hands are ahold of the grips without squeezing the black juice out of them.
I found that buzzy hands was a big turn off to me when riding Ducati Monsters. In that case, the engine vibes came up through the frame and into the grips. Because I was leaning far forward, I put a lot of weight on my hands. When I learned to engage my core more and lean less on my hands, I found more enjoyment from that machine.
The Silverado does not have the Ducati problem of position, which brings me back to the idea your old bike may have had some issue causing the buzzy feeling that caused your hands to go numb.