That high speed weave is usually cured by solid engine mounts. That weave is scary. Been in that weave in high speed sweepers many times.
I do not have a VMax but I do have it father in a sense. I have a '85 Yamaha Venture Royale with the V4 1200. You can say it is a fully dressed VMax.
Personally, I think that 800lb'der actually handles quite well.
What does blow about them are the carbs. They will varnish fast on cheap gas and they have got to be the worst rack ever to take out and clean. Putting that rack back in is horrible to.