I have the same problem.
Brand new GPU GTX1060 A series
I m getting 18-19 MH for ETH
280 Sol/s for ZEC
How could I increase the speed for ZEC ?
I set +150 coreclock and 600 memory clock at top. (The upper cause the computer crashes.)
I m getting 305 Sol/s with this settings but it s not real value because the pool never shown this hashrate value. I see 260 Sol/s on the poll all the time.