400mm sounds good! Did you go for a smaller pendant?

When you're doing lighting in a kitchen it's a good idea to have good directed light over the main tasks areas, cooking, dishwashing, food prep. You could achieve this with downlights directed at those areas, or track lighting where you can direct/angle each of the lights on the track. Re the pendant over sink area, would need to be at a height that ensures safety - water & electricity, not a good combo. There may be some NZ standards that you can refer to, to get the correct info.

Have you tried a custom lighting specialist?

Changing out my pendant lights dramatically changed my kitchen for the better. The slim modern horizontal shapes made the room feel wider and the colour changed the colour of the wood grain finish of the cabinets.