I try also to use KitKat on FP1 but there is a problem with the localisation in Osmand. The lacalisation arrow (blue arrow) have clitches (short interruption) which causes together with the net work location service a jumping localisation. I did not have that in android 4.2. Do you have the same problem?
By the way why do you use KitKat 4.4.2 and not KitKat 4.4.4 (Hoffmann’s ROM)? I assume that KitKat 4.4.4 is more saver because it have more security patches.