Coupling caps

I own a Tube Audio Lab WE91 300 amp and a JE labs linestage. They use Jensen aluminum foil POI coupling caps and I am thinking about changing them out.

I have some Jensen paper tube copper foil PIO caps on the way and was also thing about the Dueland copper cast and Jupiter copper foil paper/wax . Has anyone changed coupling caps in any of the TAL equipment or can venture opinions? There a lot of "shootouts" around using different equipment so there are system and listener dependencies in these evaluations.

Personally, I value a smooth midrange as opposed to extended treble as I have some hearing hyperacusis issues that make me very sensitive to upper mids and treble such as sibilance.
Just call them and give them the value you want. Make sure you know the uf value and voltage rating. I purchased .47 uf at 600v.

They require you to call in. That is what I did.
A killer combination Jupiter Copper foil Bees wax cap
And 30% Arizona  Blue paper Mylar oil capacitor 
Very close in some way better then  Duelund Cast capacitors.
Jupiter condenser  carries both. If you have yo use a Big value 
Say 30uf  then buy the new Clarity Csa-  cap,  20uf ,                       5uf Jupiter Copper 5uf, and 5uf the Arizona Cactus Blue  capacitor
The Blue has the best bass of the 3, paper and Mylar mixed in,more Mylar for depth.  cactus caps red is all oil paper very nice for mids,highs .newer green has more paper yo Mylar ratio in oil 
Good Bass just not quite as fat sounding.  Original company-
West cap made msny of the vintage guitars of the 60s sound 
That classic great sustain  and warmth .in your sudio fantastic 
The new designs 3 Very hood engineers from Japen took  on
The challenge and did a great job  .red caps small values.
Although late to reply on this older post. Frankly, I never heard better capacitors than the Russian K40Y-9. It is the most musical capacitor I ever heard. Needs 50 hours to start sounding right & first 10 hours is not so good at all.