Seeking opinions about phono specific interconnects

What phono stage are you using? How do you have the cartridge loaded?

IMO, for you, the best solution would be a multi-band equalizer.

I would start with an inexpensive one, if happy with the effect, keep looking for one that fits your system best and perhaps higher quality

If nothing else, you will have learned which frequencies need taming for you, that helps when evaluating models of cartridges/cables/phono stages/any component you might consider in the future. 

Does your preamp have two outputs? Put eq between preamp/amp after riaa eq has occured.

Do you have a tape loop to try an equalizer in/out of circuit?

@cleeds 

Phono stage is a Manley Chinook. The existing cart is a high output moving coil (1.2 mv). The recommended load is 400-47,000 ohms. I usually prefer the lowest setting to minimize brightness. A similar example is that for moving magnet carts I usually set the capacitance below the spec. amount, again to reduce brightness. Don't forget that I am very much more sensitive to brightness than nearly all other people.

@elliottbnewcombjr 

Your suggestion is a good consideration as a tool for learning purposes. I may just look into the idea.