@Kiba, could you give TeamRed's Cryptonight miner a go? In my opinion, Kerney and Todxx have the cleanest V8 kernel out there, and it actually scales well with increased core compute; leading me to believe that CNV8 isn't always memory bound, at least on the vega architecture anyways.
Unfortunately that miner software does not work with the Radeon 7 at this moment.