JeffK suggess that the changes in this TF may be due to the unlocked HEPI reducing the frequency and Q of these HEPI modes in the ISI. I can only find HEPI unlocked but with no fluid flowing for HAM3. In this attached plot, the modes in question (between 10 & 40 hz) have not changed. Maybe the fluid needs to be flowing, maybe the loops need to be closed as well. This is why we need to collect lots of data still.