Welcome aboard!
With regards to the Bujinkan, although some members have some idea of Koryu, I've found that the level of actual understanding is lacking to say the least… which isn't surprising, really, as (despite some individual's beliefs) there really isn't much to do with Koryu there, outside of the sources for some of the material. Additionally, training in a Koryu isn't really about the "techniques" at all… and training in the techniques (by themselves) isn't really anything like training in Koryu… the same way that knowing the word "Bonjour" isn't the same as being fluent in French.
Lee Masters, on the other hand, is a highly ranked member of the Tenjin Shin'yo Ryu, a fairly late Koryu Jujutsu system potentially best known as being one of the two primary source schools for Kano Jigoro's Kodokan Judo (to give an idea of how young that particular Koryu is, Kano trained under the second and third generation memberships…). Lee, and to a degree his son Paul, have been presenting seminars on Tenjin Shin'yo Ryu for the last few years, since Lee was awarded Menkyo Kaiden (and Paul has attained Menkyo), promoting both Koryu in general, and Tenjin Shin'yo Ryu in particular. I've heard largely positive reviews from a range of martial artists with different backgrounds, so if you get the chance to go, it might be something you like.
One word of warning, though… it's really little like the "traditional" Jujutsu you've been exposed to… which isn't traditional, Japanese, or (to my mind) Jujutsu…