Nichicon KA or KT?

I'm looking for a good choice for 105 degree small caps in an amplifier. Nichicon KZ is obviously top choice, but the KZ are too physically large to fit in the spots on the board. Nichicon FG Fine Gold is too warm sounding, excellent midrange, but no high frequency resolution or excitement.

So far, the consensus has been that Nichicon KA is excellent bass, but lacks life in mids and highs. But on the other hand, KW typically has flubby quiet bass and recessed mids/highs -- that is until it burns in 100-200 hours, then it becomes excellent. Has anyone here fully burned in KA caps yet? Has the mids/highs gotten better?

Also looking at KT caps if the KA end up being too soft / lackluster.
 
The amps do get hot, so I'm concerned about putting in 85 degree caps on the amp board. I'm just trying to find out how the KA caps sound when they are fully burned in. We know that they are soft and lackluster in the mids/highs, but does this last?