I added a third edit - those values were for an S3 here's the one from an S1 --bitmain-options 115200:32:8:35:400:4f81 and they are from the System Log NOT the Kernel Log
cgminer.exe -o mypool:port -u myworker -p x --bmsc-freq 0F81
gives almost 60Gh on one panel, but still HW errors.
And the chips are all hot.
The cgminer for U2 is quite different, and the parameters aren't the same.
Yes, the parameters are clearly different, but at least there's one for setting the hex value (as per your line), now what about the freq value? Any ideas what the parameter is?
Come to think of it, I think the time is ripe for us to either:
1. request the maintainer of cgminer incorporate the S1 (and S3) drivers into a windows binary or:
2. for us to do our own compilation to include those drivers.
as clearly the U2 compilation is going to give us headaches galore!