And it's not very good fan algo control by miner. Trixx auto fan control works much smoother. For example it stable with 75 degree and 41% fan with Trixx. Your's goes much higher to cooling down GPU and then much lower when temp is far from 75 degree. So it's go up and down too much.
As i understand right automatix trix control works with preemptive mechanism. For example if temp target 75 so if it's now 74 the fans goes up a bit and it's looks smoother.
Do you realize that Unwinder (who is behind Rivatuner, Afterburner and Trixx), had worked for more than 10 years polishing the core of the program And fan control mechanism?
As for Polaris, fairly sure most miners will work on them - they are base on same same GCN architecture