What tester are you using, Fluke DTX?
What test standard are you testing too?
Cat 7 should only be used with GG45 connectors if you want Cat 7 performance.
What are your failed results failing on, NEXT?
What make of cable, outlets and patch panels are you using?
Why are you using Cat 7? It is not ratified yet, so in theory there is no test standard. Please don't say future proofing...
I install Cat 7 Nexans Marine on Oil Platforms and Vessels, but terminate it with Cat 6A connectors and then test it to EN11801 Class Ea (cat 6a). Clients ask for Cat 7, but don't have a clue what it will give them.