It's possible your phone isn't using the CDMA portion of the phone while being on LTE. Most likely true if you're using Advanced Calling, or if your phone lacks dual radios (most new phones do). Could be something else though.
To enable/disable bands on a phone, you would need to enter the engineering mode menus. This is usually done through a code entered into the phone dialer, or using an MSL Code (obtained from Verizon) against the phone to access the band settings. Once there, you should be able to actually adjust band priority, and also turn on/off certain bands.
Just note that messing around in these settings can render the phone unusable. XDA Developers (a place I probably can't link to here) is a good resource for much of this, along with Howard Forums. If you make a change, be sure to test your voice, data, and SMS Services throughly, and undo any changes made if they have a negative effect. Otherwise you'll be factory resetting the Nexus.
The presence of Band 2 at your home means a tower is close by - performance should improve on this band in the coming months as Verizon transitions this spectrum from using 5Mhz channels, to something larger such as 20Mhz and tunes it a bit more. On a 5Mhz channel (LTE Discovery will help determine this), the max possible LTE Speed is around 35Mbps down, 6Mbps up. On 20Mhz, think around 150Mbps down, 20-40Mbps up, and more with some tower improvements (4T4R) Verizon is working on.
