I am only getting about 400-600 KH/s with a 1080TI. How is everyone else getting more? Do I have something set wrong?

setx GPU_FORCE_64BIT_PTR 0
setx GPU_MAX_HEAP_SIZE 100
setx GPU_USE_SYNC_OBJECTS 1
setx GPU_MAX_ALLOC_PERCENT 100
setx GPU_SINGLE_ALLOC_PERCENT 100

nsgminer.exe --neoscrypt -g 1 -w 128 -I 18  -o stratum+tcp://mining-dutch.nl:3616  -O username


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 OCL 0:  65.0C   64RPM | 638.9 637.6 587.4 KH/s | A:25 R:0 HW:0 U: 2.8/m