you can find the characters for "soo bahk do" in that order on tenedorio sa bom nim's website, http://www.sbdki.com/
they are the three characters down the left hand side of his studio's logo (soo bahk do karate institute, with the fist in the middle). fyi, the characters down the right hand side say "moo duk kwan".

you are correct about the characters used in the moo duk kwan logo.

yours in soo bahk do,
pj steyer