I don't have the years of real-world experience that a lot of guys have here, and this is not a recommendation, just my own journey.
My jump from lower end Nordost started by looking for high-end OCC conductors.
This led me to Zavfino. IMO the value proposition is highly competitive. I'll be good for quite a while and you could go top of the line for a small fraction of what you are proposing.
Details in my profile should you be interested.