i working with next:
setx GPU_MAX_ALLOC_PERCENT 200
color 0a
*[disc]:\vertminer\vertminer.exe --scrypt-vert -o stratum+tcp://[pool adress]:[port] -u [your name on pool] -p [pass] --lookup-gap 2 --thread-concurrency 8500 -g 1 -I 16 -w 256 --temp-cutoff 85 --gpu-engine 900 --gpu-memclock 1325
try to experiment with I [15, 16 or 17], concurenncy from 6000 to 8000
I have rate 230-240, it is a half of doge or lite coin, but so is with vertcoin, have per day 3.2 coins