I’ve never had a problem with pure silver, and have found it among my very best choices in IC’s. I’ve had issues with silver plated which for whatever reason seems to take a while to break in, then sounds just like copper.
Personally for my most critical connection (DAC to Integrated) I made my own IC’s from DH Labs/Connex cables from Parts Connexion. In addition to being pure silver they are balanced, and foil shielded so ideal for XLR. The one downside is that being solid core they are a little brittle and can break at the terminal. Otherwise I now stick to Mogami and World’s Best. My experience playing around with Wireworld IC’s made me realize that so many boutique brands were just masking one frequency or another and I’ve tried getting away from that.