USB 3 Hard drive dock for backups

I had a lot of problems getting a working combination of a USB 3 PCIe adapter card and drive dock. What I eventually settled on is a Vantec adapter card and dock:

http://www.newegg.com/Product/Product.aspx?Item=N82E16815287007
http://www.newegg.com/Product/Product.aspx?Item=N82E16817392037

But I've still found that the dock is sensitive to the drive being inserted properly and to the USB cables being well seated. I had a period when I was getting disconnects and solved it by reseating both ends of the USB cable. I have a feeling that the USB 3.0 connectors don't make connections that are quite as solid as their USB counterparts - perhaps a result caused by trying to jam the extra conductors into a compatible connector.