this i tryed for zcash mining on slushpool:

setx GPU_FORCE_64BIT_PTR 1
setx GPU_MAX_HEAP_SIZE 100
setx GPU_USE_SYNC_OBJECTS 1
setx GPU_MAX_ALLOC_PERCENT 100
setx GPU_SINGLE_ALLOC_PERCENT 100
start nodevfee.exe ZecMiner64.exe -zpool stratum+tcp://zec.slushpool.com:4444 -zwal yourworker.name -zpsw x  -r 1 -allpools 1

i think it work ok, but sometimes i see:
DEVFEE: Start mining (90 sec)
.
.
.
DEVFEE:Stop  mining and disconect

Why is that?