Don't seem warm with the VSMs, might with warm speakers with mid-bass humps.
The amps won't match well if it is underpowered, or in the case of a tube amp if the impedance of a speakers is very uneven and dives very low in the bass region. This doesn't speak to the sound of the amp or speaker, but simply electrical matching - you don't want to be underpowered, and you don't generally want a tube amp with a "tough" speaker load, for which SS is better suited. I don't know if the H/K amp sounds good or not, but it should not be a matter of "matching" electrically, it should be fine on those grounds.