you should be able to get to a core clock of 1500MHz and do a +300ish on the mem clock whith the power limit going on ,ax and +70ish mV.
this is what I have. not all the cards are the same and some will do better or worse. start by adding 150 to the core clock and 200 to the memory clock with vith your voltage and power limit on max, and start reducing or increasing from there on. it's a good base to start with.