The default intensity (-1) dynamic works best on other pools because you can get stale shares on etheremine.

--xintensity 60 works good on the rx 580
--xintensity 78 works good on the 6800xt

SO perhaps something in between?

For no stale shares use something like --xintensity 24 (flexpool, crazypool, nicehash)

xintensity -1 is good on miningpoolhub, nanopool, f2pool and 2miners.