Nearly $33 for each of those 4.7uf caps? My wallet won't let me indulge in that.
I have recapped several pairs of EPIs, and the 10uf caps, for those speakers, are almost $60, each, for Silver Z caps! For a pair of speakers that sells for much less than that, I can't justify the expense, myself. I still need budget room for binding posts and cup, resistors, surrounds, and internal wiring. The Dayton 1% caps are more than adequate, to my ears.
If I was working on a significant build, with many many dollars invested in drivers and cabs, maybe I would consider going higher on the foodchain. I know that Focal uses those Jantzens on their Grande Utopia. If you can afford the Jantzen Silver Z-cap, by all means, use them, and enjoy.