try increasing your fan curve as this game takes my rx480s into the 90s after 5 min of gameplay unless I set the fan manually to 50% or higher.
also personally I'm getting way better results using 17.10.1 even tho the other drivers "added support for destiny 2"
I have not worked many with the wattman settings. can you explain what exact I should try?
For me there is now the end solution - after 20 years fan of amd and ati, its time to finish it. 2 years ago I have allready switched from amd cpu to intel cause of the better performance.
Now a friend has brought me an gtx1060 only to test, and see there... everything runs smooth as it should.
My heart bleeds for this solution, but in the last years I got more and more problems with amd graphics (driver problems,heating problems, performance problems where none should be, and many more) and the support is not that good, only all time the standard "solutions", its since years the same... new card - new problems.
And now after 20 years of many buyed amd/ati products, a lot fights for pro-amd in socials medias, websites and forums, I have ordered my first nvidia and turn my back to amd.