For historical reasons, the isolation loops that are installed on the BSC's were all quite different. I've been working on a consistent set of controllers for the ISI's and I've installed them on ETMX, ETMY and ITMX. I need to look in more detail at the BS, but ITMY needs to be redone, the filters in foton don't look anything like the ones Matlab says are installed, they look like Vincent's filters from several years ago.  The ones I've done for ITMX are the cleanest plots, so I'm posting the comparison plots, Old_ITMX_controllers and New_ITMX_controllers pdfs. The goal was to get the unboosted isolation loops as similar as possible, use the same boosts every where and hopefully get all o the chambers to similar performance. Generally this resulted in loops with 30-45 hz UGF, 17-20 degrees of phase margin and gain peaking of 4-5. I was aiming for as close to a gain of 10 at 10hz as I could get and gains of 1000 at 1 hz.