Thanks Paul
This forum is great thank you all for the support/advice. Researching around it looks like ML on 2017 LC500 is too front loaded and this issue has been commented on by quite a few other owners. Using the fader makes very little difference. I suppose when its the top of the range lexus one would have expected a top of the range ML system. It not as good as the one in my current RX450 and way below par compared to the one I had in the GS450h which did shake the car with its base.
Hey Ho will have to listen to the engine more!!
At some point if I plan to keep it may take it to an audio specialist and upgrade.