Maybe I posted this question in the wrong forum or maybe the way I want to monitor can't be done!
Any suggestions anyone?
I imagine you ask because you want to do something like pencil mod one board, or one section of chips, to see the difference?
AFAIK there is no way to do this. Your best method would be to record the 20min average at current setings, then change and re-record 20min average. If you have a few machines you can try different changes on each to see the differences.
but no, i dont think there is any way to monitor more accurately than the entire S1 hashrate