Ok, added Wink in as a repeater. No change. I don't think it is a signal issue because Hub is only 15 feet away from blind. Also, I have tried adding repeaters as well, which didn't help and neither did adding Wink to the hub. I think it is a driver/command issue.
I think I have tracked down the actual product on Z-wave alliance site. Bali & Graber, both are from the same company 'Spring Fashions'. This is the product link and here is its Z-Wave Network Management Instructions. I wonder if the following recommendation is not baked into the driver code?
The Wakeup command class should be configured by a hub when the remote is joined to a Z-Wave network. A WAKE_UP_INTERVAL_SET command should configure the NodeID at a minimum. The Wakeup interval can be configured to any value from 6 minutes to 25 hours. Recommendation is to leave the interval at the default of 12 hours to maximize battery life. The remote will wake up every WakeUpInterval and send a WakeUp Notification command as well as a battery report to the NodeID assigned with the Interval Set command. The WakeUp Notification will be sent within a few minutes of power being applied to the remote and then once every Wake Up Interval. A Wakeup Interval Capabilities command will inform the hub of the default, minimum, maximum and step size of the Wake Up interval.