Please don't report issues if you mine on Dwarfpool, today this pool has some problems.
Use "-h" option, read Readme for details.
I made that test, first computer 5 gpus with -h 1024, second computer 5 gpus without -h, usually 3 out 10 gpus reach highest hashrate values, others will need to be tuned via console with "m" keyboard key and then "-" and then "+".
I don't have any ideas, sorry.