hi,
i'm not linux specialist, however, i know and successfully use claymore miner, i see missing -epsw x command,
and "GPU #0 recognized as Radeon 290X", however, a far as i know, 380x is simplified version of 290x

i would try this way

add -epsw x
disable dcr mining and try eth only mining
if not successfull check gpu core clock and if low add a command setting target gpu core clock speed in Mhz
it is important to disable dcr mining, as you are interested in gpu clock speed for eth mining
gl
mxclene