Default [Q] Can Sprint users activate/turn on LTE if there is no Spark in the area?

I live in Chattanooga Tennessee. Sprint Spark is not active here yet. My HTC One had excellent LTE service but my One Max is only getting 3G. After a restart or PRL update I do see the Spark LTE icon but them it goes away back to 3G. When I am on the road around town data connections are choppy using video or Pandora.

Does anyone know a way to turn on the regular LTE that I once experienced on my HTC One?