Thanks man, I actually did try that as well, but I worked out the ETH return was not as good as mining straight SIA coins and converting the SIA coins.
I get about 3,000 MHs/s from my 1080 Ti, pretty sure I was getting about the same stats as yours when dual mining too. Another coin that looks efficient to mine is Z Cash... Going to try that too when I get my new video cards.
Have you done any CPU mining? I am trying to mine Monero with my CPU but it is really slow compared to GPU mining obviously