Miner settings are standart - 2 threads with 2016 and 1800 intensity.
Vega 56 crashes with 1800 on the second thread. That might explain the hash difference.
Currently doing 1850 H/s with 2016+1600 threads.
I tried 1850 intensity for the second thread, got 2000+ hashrate but soon crashed.
2016+1800 seems stable so far