To build on what you've said, Bill, in my opinion there are no "minor vibrations" in high performance engines. Odd vibrations are an engine's way of telling you it is slowly (or not so slowly) killing itself.
Now, the beauty is that in the model car world, none of these inconvenient realities matter. Our "Hot Rod Shops" have unlimited budget and the best talent that unlimited budget can buy. They can accomplish anything we can imagine.