Help after my recap, my tweeter is faint and reserved part II


So if you look i posted about this previously. But because that post was so old I decided to repost.
So I re capped a pair of mirage m1 speakers with jantzen superior z caps on the tweeters and standard z caps throughout the rest. Afterwards  the tweeter sounded faint and reserved. Initially when this happened on the first speaker it seemed to only be a problem when I used Tara  labs  cables. I was told the difference in the esr in the shunt caps was the issue. This seemed to be confirmed when I swapped all the shunt caps back with the original electrolytic caps the problem went away. However since then I got an esr  meter and found the difference  in esr  was minimal if not exactly the same. Not knowing what to do I figured I'd just  ditch the Tara cables and find  another cable that didn't have the issue....
However here's the new problem. I just finished the other speaker and there's  the problem again. Only this time it occurs when I'm not using the Tara cables and swapping the shunt caps back with the original electrolytics doesn't change anything.
So I'm wondering if the other speaker was just barley  breaking in and that's why the problem started being less noticeable and not an issue with common cables. 
Sorry it took me awhile to repost but I moved and it got out on the back burner.
Any help here would be once again appreciated.  

idahifi
That is quite possible.  I have no experience with the Jantzen Z caps, which appear to be metallized polypropylene.  However, there are some electrolytic capacitors (such as the Nichicon KW) that will be very weak and sound bass-shy when they are new and used in an A/C power supply bank.  After 20-30 hours of break-in they will become significantly stronger.  I theorize that a new capacitor may not be able to charge/discharge as efficiently until they are broken in a bit.  The concept is the same in your tweeter crossover where the capacitor is accepting an A/C charge/discharge waveform (since all analog audio is alternating current of different frequencies and voltage).