I would pull all three of your CRs to see how CapOne is reporting and to make sure there are no CAs reporting on their behalf.
CapOne usually keeps the debt and will hire CAs to go after you. If you just got a letter, send a DV ASAP CMRRR. There's a high chance they won't validate and will go away. But more will come in their place.
If reporting as a CO CC with a balance, then it is hurting your scores due to the utilization. I would start saving now for 100%. You can always use what you save to offer PFDs between now and the time you home buy. CapOne is not known to accept PFDs. When you get closer (2 mo. prior) to the home buying date, and they still haven't accepted PFDs, then I would bite the bullet and pay 100%. You'll likely see an increase in scores.