This seems to be the only setting that works, If I set it higher, or lower it fails to respond. 800 is not even in your list of preset clock speeds. I've adjusted the power, lowered it, raised it, not difference. It is hashing at about 3.4Mh/s with HW:251/.20% in the last 21hrs.
If you set it to something not in the list it will go to the default speed.
Try to start at the low end of the speed table, and work up from there. Adjust core voltage when it no longer hashes reliably.
Don't start anywhere near 800 until it's tuned in and you're sure the temperature is manageable.