No commissioners asked for this, but I was curious so I installed Rich's sensor correction filter on the HAM6 ISI. It looks like it does good things, but I've only tried Z so far. I don't really know if there are any optics or useful oplevs on HAM6, so I'll bug commissioners about what metrics they would use at that chamber to measure performance, but the ISI's own sensors show improved performance down to 100mhz and very little re-injection below that. First attached plot is before, second is after. Comparing the upper right plot on each shows the improvement. It's interesting that RX and RY also seem to be improved.