Warn Sound Capacitor

I don't know if caps will make enough of a difference.  My understand of Clarity caps is they are a bit more higher resolution and uncolored.  The Mundorf caps may be a little colored/veiled in comparison, but that's a hard call.

Probably the best way to tame a tweeter is to start using a lot of pure copper interconnect / speaker cable and ensuring that the terminations are all gold-plated.  Get rid of any silver or silver-plated elements in your transmission line.  This can also include digital cables, such as S/PDIF COAX or HDMI.

to me are mundorf to be enphatized in the highs

If you have a resistor in series, then replace it with Path Audio. Resistors play a big role in tone also. 

Hi,
if you have a very open tweeter and want to tame it avoid mundorf, especially the white line. For tweeter use CSA would have less sibilance compared to ESA. Another alternative could be Obligato premium gold with a nice pricing. Whatever you choose leave it to settle as caps may require some time to run in.

It might not be a bad idea to know the rest of the circuit?

Is there a resistor in series or parallel after the capacitor shunt, and do you know the value?
I don't want to suggest shunting more energy to ground as I'm not wanting to kill your amplifier :-)
if you don't know what you're doing?