Do high dollar mono blocks truly improve the Sound Quality over the mid tier amps

Those are good amps. Cost alone means nothing. You can always change if you don’t like the amps for whatever reason: to try newer technology or a different design, a different visual look/aesthetic, measured performance, or whatever you please. That’s totally up to you. I just would never ever make a change based on price alone.

Also always a good idea especially with big ticket items to either audition first or be sure to have a cost effective way out if things do not pan out as expected.

Mono blocks are only advantageous if you are switching to them from an amp that had high levels of crosstalk. A competently designed, high-power stereo amp can be just as good or superior. 

@helomech A popular audiophilism is that the shorter the speaker cables the better.  Do you think this is a significant issue?  Thanks.

I have been demo'd ESL's I am familiar with as a model, that were modded to be direct coupled to Power Amp's. These ESL Speakers were indelible and I have not heard a better ESL from any Brand experienced in use. 

I suppose this could be called a Active ESL.

I have not heard non-Active Cabinet Speakers converted to Active so it is difficult to make any further comments on betterment as a outcome.

Is your room well-treated? Any upgrade should consider the degree to which the room will or won't allow a real difference in component to be audible enough to be worth the money.