Datu, Kishan would have been my choice. At the time there was only an inoperable Mridian Viewray at UCLA. I don't know if UCLA has decided to use other MRI guided radiation treatments (which may be preferrable with Kishan as your RO) or if the Mridian Viewray has been restored. At that time the margin with the Viewray was 1 mm narrower. Back then there was a Viewray at City of Hope Irvine and another at Hoag in New Port Beach.
You are in a great position. Best luck with your treatment.