Default Device behaving badly after updating to NAE while keeping MF9 bootloader

I followed the instructions in the thread that describes how to update to NAE from MF9 while keeping the MF9 bootloader: http://forum.xda-developers.com/show....php?t=2277480

I was on MF9 stock rooted (with TWRP recovery installed when I flashed the NAE modem via odin 3.0.7, not sure if that makes a difference).

All the steps seemed to go okay. As far as I can tell the versions look good. However, the device is super sluggish at times, especially the dialer. Sometimes I have trouble waking it. I can't toggle the WiFi on. I have not set the hotspot mod or sd card mod yet.

The device is essentially unusable. Every so often I will get a request to force close some app (like the dialer) because it is hanging.

I tried repeating the steps described in the thread above over and still get the same behavior. The second time I also did some more checking in the intermediary MK2 step after everything was set up and I did notice that sometimes it was doing the weird hanging problems there too (i.e. even before the NAE rom was installed).

I had no problems whatsoever with the device when it was on MF9.

Help! Any ideas??