You are getting almost all what you can get from that card. Running 471 sol/s per second I think it is one of the best setups for a 1070 card.
You can try to increase the memory clock to max of +1000 if your cards hold to it but 800 it is a pretty good number. If it crashes when you increase to 1000 go back to 800 and stick to the settings you have found. Also increasing power limit to 90% or 100% can give a little boost in performance but I think you have already are in some of the best settings for your card.

My GIGABYTE G1 1070 does only 432 sol/s on Nicehash and 455 sol/s on EBWF cuda miner with +750 memory and +200 clock. I am going to follow your example and try to make -120 core clock to see if I get any improvement.