New Zealand wet stages have very strange and inconsistent grip.

Did a few stages with my Club in Oceania, most of them on wet surface, we all had the same experience (in S1600). Fantastic grip for a few kms, then grip suddenly falling off a cliff. Feels like tyre degradation was pushed to 1000% and I was driving on slicks after half a stage, massive understeer in slow corners. Every other player in the Club (~15) reported very strange grip behavior. Please fix it!