Sorry just noticed this thread but I think you've probably got it solved on PB now.
But I will add that sometimes speed alone isn't the only factor, positioning and timing of the Full House JC can play a role.
If you think you're doing it fast enough but it's still not working try doing it from a lower position (E+I Raves can help with that) then you'll be able to see if it's just a timing issue or the setup itself.