I only get 440 sols using gtx 1080 on excavator. I get 500 on ewbf. Any ideas? Am I missing some setting
Yeah... you need to overclock your 1080 on excavator to get the same on stock settings on ewbf..

they still need to do more work on excavator.
i have three 1070, one 1060 and doing 1600 Sol/s pulling 600 watts at the wall with ewbf all cards at stock settings.
with excavator i'm doing 1450 Sol/s pulling 560 watts at the wall with stock settings.