Thanks BOAC, some interesting points
Unfortunately an inoperative A/T precludes CATIII approaches with my lot; although I respect the fact that it may not be necessary for auto-coupled approaches on the 737. In my case I refer to the 738.
In reference to setting full GA N1; I believed that the S.E. MACG of 2.5% (in case of a CATII approach) became the limiting factor? In my airline it is taught that in most cases no greater than 90% N1 is a necessity for a manual go around. This aids the controllability of the procedure. Obviously additional thrust is available and this is trained as an obvious consideration to make under particular ambient conditions.