Duelund cast Pio Hybrid Copper/Silver or Rs series with Silver Bypass PIO

I have seen little mention of the VH Audio Copper- Teflon caps I have been using 
these and for resolution none better ,but take up to 4-500 hours runin time.they are flighty warm ,but not much speed and resolution
for a bit more air  and  depth the Duelunds are vest 

They are nice, but not my particular cup of tea. Just a tad too thin sounding vs Juputer or Duelund CAST. 

grannyring do you know the Morel ET338? What do you think which capacitor is the best for this tweeter? 

I don’t know it, sorry. What do your hear and want to improve?