Can you provide the snapshot of schematic? We can do a quick check and review it. If you think its confidential, you can create a technical support case and Cypress technical support team will evaluate them.
Thank you for getting back with me. After talking things over with a Cypress FAE, it appears that we had our CUR# pins pulled low (since the designer wasn't planning on monitoring the current), which apparently caused the lower devices to not enumerate. Once we pulled those high through a pull-up resistor, everything worked fine. Thanks again.