if anyone shares Vega .bat settings , would be glad to appraise.
Try starting with the following configuration for Vega (there's some more tips for tuning your settings
here):
set GPU_FORCE_64BIT_PTR=0
set GPU_USE_SYNC_OBJECTS=1
set GPU_MAX_ALLOC_PERCENT=100
set GPU_SINGLE_ALLOC_PERCENT=100
set GPU_MAX_HEAP_SIZE=100
:: Set the pool, username, and port here. All three arguments are required.
sgminer.exe -k x16r -o stratum+tcp://pool.here:port -u user -p password -g 2 -w 64 -X 320
Let me know how it goes

Awesome, will give it a try later today.
There are no AMD miners for X17, but it seems similar to X16R with 1 more algorithm. Is it possible to port the optimizations into a separate X17 miner/kernel?
That sounds doable; I'll look into it.
R: (which I guess shows GPU load) is dropping to 5-10% on some of gpus and later on makes them sick. with -22% pl it showed 10 mh/s on some of healthy GPUs.
My Vega rig is remote, I can't risk and keep it working there for now - not stable