I've got no positive results on RX 470 4GB rig even I tried all different miners including the new lol miner 1.16.
I haven't change the old blockchain driver and the result is still poor, max 10 Mh/s for the whole rig.
Now I'm waiting for ETC Thanos fork at the end of November.
But this is normal... the DAG file is too big that it cannot be all loaded in mem... you have been using the Zombie mode that allow you to mine but with lot less Mhs... at least you were able with this miner. If you want the best improvements mine ETH until the fork of ETC. That will give you better performance until the change. It is only a recommendation...