Hey theaslip,
We are doing that exact split. 4 nights at the Poly and then switching over to 5 nights at AKL. We're doing concierge at AKL. Was toying with the idea of concierge at the Poly, but we need 2 rooms and I'm not sure I can swing the LV Concierge rate. And, never having been to the poly, the lagoon view is really important to me.