You should probably start by posting your current settings.
card：1080
Software：ccminer/820-cuda91
core :+150
MEM :+200
Driver：23.21.13.8819
Dowload palgin hsrminer_neoscrypt, 1080s get 1400kh/s @ 170W with that. Also overclock memory more (+600) for neoscrypt.
My friend downloaded the address and told me, thank you. 1080 have you tested it with this software