In this of work, experience beats any level of talents...
In my actual hands on experience/comparison to both the 300max & N8ii to the dx300, I noted that there was no detail/resolution difference between them. They all displayed impeccable resolve information.
The actual difference were more how "realistic" they portrayed the musical performance as a whole.
They varied in:
1- amount & type of timbre (colorless or signature type sound)
2- holography & ambience depth
3-Micro dynamics/liveliness
It is not possible to replicate this mod easily. You need to be a seasoned professional with a professional work setup for surface mount parts, with those microscopes they use to help.
That and real world successful experience. This is not only meticulous caps replacements, with perfect bent leads additions, but also delicate surface mount part additions, with resoldering work and also insulating tape and some type of clear glue too.
Then add to that testing & measurement gear.
The level of workmanship of this EXNP service, is at the level of a "work of art".
Solen get bad image because that make low cost film caps that are widely used because of cost, but they also makes better caps. Just have to look at what they have.
I found to like the silver MKP model they make, so I chose it for a special order:
Silver & gold... (caps)!