Well, there is a sizable monetary difference between choosing the standard caps and the Beeswax, and also adding the Beeswax caps power bypass mod. That's a fair question.
Hopefully you'll get a few answers from others here. I did not have a ZP3 with the mods, just a stock one. I have the Jupiter Type 2 caps and the beeswax power supply mods in all but two of the Decware components I have, and only in one did I have the stock configuration beforehand. I honestly think the differences boil down to: how much of an audiophile ARE you? The stock caps are very musical, and slightly forgiving. Your music will groove and soothe and you will think less about microdetail and the quality of the recordings than you will with the Beeswax caps. These just seem to give you one step closer to the ultimate sound of the recordings--a bit more detail, a bit more small dynamic differences, less shadow in the corners of the presentation. They'll also just a bit more show you the limitations of the recordings especially in frequency balance in my experience, and allow you to identify a bit more clearly any changes you make in cabling, power, isolation (etc.?) At times when I get obsessed about sound and equipment I wish I were less so. . . I know I could love my system with the standard caps and be perhaps less "analytical." For me I become more "analytical" in my listening more often and thoroughly when listening to digital than analog, though that is probably strongly influenced by my components.
Regarding the RCA connectors: I have mostly the silver options but also the gold. . . and my interconnect terminations are Rhodium plated.

Hard for me to say that there is a sonic difference, I haven't really identified one clearly--though I confess that the longer shank on the silver and the tight fit are confidence-inspiring.