Why would you climb at 2500 ft/mn + to gain 1100ft on a MAP ? If flying a top end aircraft, you need to "trigger" the logic by "passing by" the GA ( like on ATH or similar,) but then...it is either all automatic, and they do reduce nicely, or the automation is crap, and then the magic hands just have to throttle back...
I do not know NZ precisely, nor the airport you are referring to; but some people may be holding somewhere around you etc.. If the initial GA around altitude is set at this value, there is usually a good reason for it..
my view of course..