That's generally been the case with stock mounts for me too; I've collected a few that work well in certain situations, but for the most part moving forward I'll be making mine with custom mounts.
The mounts for these, especially the pot cores, can get real pricy real quick. I'm having to get creative with the way I do my own.
I've just completed winding three new cores with my new roll of Litz wire. I gotta say...it's much easier to work with than the stuff I was using before. More flexible, less likely to break. Its thicker, so it lays down easier, but I'm still getting like 40 ohms from a completed nominal 525mH coil.
The experiment here was to track my progress in programming the coil winder. #1 was *way* off and resulted in a coil that was heavily scatter wound. So....lemonade, bitches. #2 was less scatter wound, #3 had minimal to no scatter winds.
I'll be assembling them today and doing a comparison. There are still variables here that I can't quite account for: clamping force is still a beyond my current abilities to measure, and there will be some natural variation in the cores. But, in theory, scatter winding will have two impacts: a decrease in parasitic capacitance, and a decrease in inductance.
Will I be able to observe that? Dunno. Too many unaccounted for variables. Plus, I'm just a guitar player banging rocks together. Who is also a literal stick man.