Well Dunnagh, I think the key ingredient we were missing yesterday was full voice comms. Tried again today with Bobkyou, and a few others from the fleet using vent. The strategy remained exactly the same, but I think that little extra time it takes to type something out over just saying it made a big difference. Also knowing that everyone in the team is focused by these means is a huge plus.
I still think the transformer mechanic needs some tweaking (It still just comes down to luck sometimes the way aggro locks onto, and won't let go of people sometimes for no apparent reason) but I won't be doing this STF again without full voice comms.