Recommendation for a highly resolving amp

@chungjh
You have a nice system, but I agree that the quality of your cabling does not match the level of your components - they’re creating a sonic bottleneck. Initially, I was going to go your route and try to spend minimally on cables - I hated the idea of spending significant $ for them. But over time I VERY reluctantly realized that cables that don’t measure up to the quality of the audio chain will leave the sonics seriously short of of their potential performance.

A few vendors allow for free home trial. Also buying used can save you significant $ and if you don’t like them you can resell them.

The Cable Company has a cable library you can try for a fee also.  May be the best way to dial in the sound YOU like.

Due to a renovation type project at my house, I had to opportunity to have my system setup at a friends house for a while.  The acoustics of our two rooms are very different and my system sounded very different at his house.

I don't understand how listening to two different systems in different rooms could be sufficient to determine which component in one of the systems needs to be upgraded for that system to sound more like the other.

What you are saying is true. However, what I learned from his system is what it sounds like when there is higher resolution. I am not necessarily trying to recreate his sound; just better sound for my system.

Getting back to the original question about a highly resolving amplifier my current Pass Labs XA25 is very resolving and transparent, some say the most transparent and resolving they have ever heard. 
It is much more so than the Parasound a21+ it replaced but not a night and day difference.  
The ultimate transparency and resolution you hear is a function of every component in the chain, the amplifier being one part.