I really don't understand how you guys have such variables in CCA cabling, i never heard of it before ordering 305m.... but i have gbit fiber and my connections and links are totally fine for years on such cabling.
Even what i see in stores mostly the "affordable" stuff is CCA, so, it cannot be that bad.
I do have sometimes DNS issues with my pi-hole, i have to disconnect and reconnect my pc, i'm not sure on the interaction but the pi-hole is directly into the router by a 0.5m copper factory cable.
The longest run i have is probably 20m, but i have 10~ of them.
Still, i'm not trying to discredit standards nor vouch for any CCA cable, i'm saying what it works for me and most companies i see here in Portugal use.