Over the last several weeks, I have collected some HAM ISI to DARM coupling measurements. These are the only HAM ISI that don't have st0 L4C feedforward, and should have overall not as good performance as the other HAMs. Attached pdfs show the coupling to darm for the closest analogs to their associate cavity length, pitch, yaw and vertical dofs. It seems like HAM2 generally has the worst coupling, then HAM6, then HAM3. HAM2 is already planned to receive st0 l4cs in the next vent, as well as lower noise vertical CPS. HAM3 is only planned to receive the lower noise CPS, for now. For HAM6, I have been trying ground to HEPI l4c feedforward, but so far haven't found a stable filter and don't yet understand why that feedforward is not work at HAM6 yet.