You are correct for a straight missed approach - the final segment starts when 50m MOC can be achieved. The answer is in PANS-OPS II (ICAO Doc 8168) - extracts are also published in Jepps.
ILS straight missed approach is a bit different - the precision segment continues until 300m above THR for Cat I (150m for Cat II & III), and MOCs as such do not really apply. After that it is 30m increasing to 50m.