My recommendation, for now, is to aim for no more than 725mhz on the S17 and not to go beyond 19.6 volts until more results come in. But at 700-725mhz and 19-19.2 you should be achieving 65-70th/s. Which is a fairly good performance gain as it is. If there is one thing I learned a stable overclock is better than a powerful overclock. When auto tune is out I would say play a bit higher but for now I suggest everyone plays it safe.
850MHz @ 19,7v I'm at 82TH
900MHz @ 19,8v I'm at 87TH
both with 0,0001%HW
Not all ASICs will support those settings (silicon lottery), need to fine tune each of your ASIC step by step. It takes times but it's the only way to optimise your hash rate
what about s9k / s9se fw?
Big headache these models. Not sure we will see one that works correctly without any risks soon.