If you are in Europe, try a Forza AudioWorks cable for your ZMF. I recommend the Claire Hybrid HPC as it is 34 grams lighter than the Noir Hybrid HPC (per my measurement). I did notice a more pleasing sound, to my ears, as soon as I switched to this cable on my Sennheisers/Audeze. There, I said it, the cable made a difference.
I did not A/B my ZMF (OFC versus FAW) because the OFC was a no go because of its poor build quality. See picture below. I used it twice. Slight aside: are all ZMF OFC cables built like this, where the cable part comes out of the splitter on arrival? My
only complaint of anything ZMF, otherwise everything else exceeds expectations, by a lot.
By the way FAW are also a good match because ZMF uses some French names (Vérité = truth; Auteur = author), so how can they not be a perfect match to the similarly French-named Claire and Noir? It's a synergy that creates that effect you get after a couple of glasses of "garage" French wine, the good stuff they don't have for sale.