Nighthawk R8000 to Virgin Media Super Hub 2 Connection problem.

Glad to hear that your problem has been resolved.  Note, technically there is no such thing as Cat 6E.  There's Cat 6 and Cat 6A.  For short runs, like 10m or less, they are overkill.  Cat 5E is perfectly suitable for 1 Gbps.  But if you are determined to go better than 5E, then skip Cat 6 and go to Cat 6A.  The latter is rated for 10 Gbps up to 100m.

Since you appear to be terminating your own cables, you should investigate whether you may need new tooling.  I believe Cat 6A, especially shielded Cat 6A, requires different methods for termination.