The other problem I have encountered with these new rules is when you have one bag of 30kg, they then try to charge you overweight limit as you are 7kg over

So find a box in my luggage and check that separately and hey presto I have 5kg and 25kg which is fine. I guess in 2-3 years time some overpaid consultant will come in and find how much money they loose by having to check and load two pieces and the extra compenation when each piece goes AWOL.
Such if live with the airlines these days, or maybe the pathetic lack of training (or common sense) that staff seem to receive these days.
This was not with NZ, but with the overly grumpy and rule rigid SK, but serves as an example of stupidity.
Mark
p.s. I used to think that 2(3)x32kg was excessive until I lived in Europe and then worked out how much money you saved bringing a bag full of toothpaste, DVDs, deoderant, clothes, books (bike!) etc etc back with you from the USA each time I visited.