More places to look at:

1. David Wink in Frederick, MD. Was an original Dog Brother, not currently affiliated though still friends with Eric Knaus. Very capable FMA/Silat man

2. Jim Tirey down in the Woodbridge/Fredericksburg, VA area. He doesn't run his own school. He's a senior black belt in the Daito Ryu Aikijujutsu/Icho Yama Ryu Jujutsu school operated by Dave Lamond. However, he possesses a lot of extracurricular knowledge (as in, outside of the AikiJJ/JJ curriculum) concerning knives and improvised weapons such as parachute cords. He and David often train together

3. Serafim Yevkusov in Gaithersburg, MD. Affiliate instructor of Russian Systema. Systema has a well-regarded approach to knife defense and combat. http://www.russianmartialart.com