Have I worked out the correct AC power draw for this power supply?
you need to open it up and look at the fuse size (since there is data missing, like supply efficiency) and add that rating. IEC-60127 requires 30% headroom on the fuses of switch mode power supplies, so your maximum current draw can not be more than 70% of the fuse. NEC is 80% current draw allowed to the circuit distribution breaker. So if you add your fuse values its still within the NEC electrical wiring safety limits.