No problem, smrobs. :]
Well, in my completely honest opinion, I would take him back down to ground work and try to find the root of the problem - why isn't he responding to snaffle?
I'll be the first to say that some horses - just don't like a certain bit. I know that first hand, and I got a bunch of fuss about it on this forum for asking about bit suggestions for a mare of mine who had not been responding to a plain loose ring snaffle. BUT I had already gone back to the ground and worked with her from there, and ruled out pain as an issue BEFORE deciding to switch to a new bit. Then I tried LOTS of snaffle variations.
Have you ruled out an ill-fitting saddle? Have you had him checked for soreness?
Those would be good places to start finding the root of the problem.
If you have ruled out all other causes, then it may well be that he dislikes the bit. You just sometimes have to play around. Some horses just need something to with their mouths, like play with copper rollers, others need tongue relief, etc.
Sorry I cannot be of more help suggesting bits - just personal experience here.