I am also on Droid Turbo (XT1254) on Verizon. I did not wipe internal data and I did reinstall some apps from Google backup. Also did not touch kernel.
I was on stock Verizon 6.0.1 marshmallow. My steps were: 1) backed up via TWRP, 2) copied ROM and Gapps to phone, 3) wiped...