That is strange. I thought the strix cooler was good from the reviews I read. If you get chance to swap it I can highly recommend the gtr. At stock it barely spins the fans at all and only gets about 64-65c under full load on mine.
Well after doing a bit of retweaking of the case i guess i must admit i was a bit to quick to say airflow is fine. I guess i was just thinking since my old 1070 ran cool and quite that the rx 480 wouldnt need more air than that (the 1070) did. I guess i was wrong.
Ive removed the 2 enermax fans pulling air in and replaced them with non-pwm fans from noctua SP-12s in push config instead and everything seems hunkydory now. No need for custom fan control anymire.. card doesnt seems to go over 68-69 on auto and that is after the temp target has been set to 75 in wattman.
So there we have it. I was being a bonehead The strix actually seems to be fairly cool card though still not as cool nor quiet as i would have liked considering heatsink size w/ 3 fans, but way better than before.