The DMA PID's should be ok, are they reading wrong or can't you select any of them?
Re the top end knock you are seeing, I'm not sure what the best fuel is in NZ, so you may have to back it off a bit. Out here with our 98 Octane only a few degrees of timing is tolerated which is about what that tune should be commanding. One thing I've noticed, it would appear the timing figure you see in the scantool does not take in to account knock retard