Silver satin cables are cat-nothing. There's no twist or pairs, so they aren't suitable for any application like Ethernet which requires twisted pair cable. Only good for short distances carrying analog or TDM voice as a line cord at the point of use, or RS232 serial which is what the 8-conductor satin cable was generally intended for.
There are flat cat5e rated cables out there, and they do generally have the required twist ratio to qualify for the CAT-X rating advertised on the packaging (your mileage may vary with knock-offs from overseas which often stretch the truth a bit). As you've found, flat twisted pair cable is very difficult to terminate by hand, as it's machine terminated when you buy pre-made flat cable assemblies.