I will try that. You know, I actually did the opposite, but only for half-good reason. I had recently built a couple of fires where the floor temperature was very low relative to the core and the walls. I realized that there was to much ash and half wasted coals piled up on the floor and it was insulating it from heating up.
I then switched things around so that after the first hour or two of heating, i kept the fire on the left (I bake on the right) so that the right would heat up from flames, etc. but not become insulated by the ash.
The floor heated up much better but, obviously that was not helping the wall. I will heat up as you described AND watch out for too much ash, etc.
Thanks fort your help, much appreciated.