The only other guy I can think of is Wide Open Cycles in Fredrickburg, VA, which is about 576 miles from you. I believe he is a forum member (Chad?), and has a good reputation for tuning. He uses TTS.
There is also "Durwood", who is a reputable tuner from Sheffers HD in Evansville, Indiana, but he is about 726 miles from Barrie.
Not sure how much free time you have, but I think it's well worth travelling to get a great tune. If you don't have time to ride down, you could trailer it down in a day, have it tuned the next day, and travel back home on the third day. I have a buddy that spent hundreds on a mediocre tune from Mackie's in Oshawa, then did a second tune at American HD in North Tonawanda, NY. After all that, I don't think he is 100% happy. Better to lump it and go for the road trip to a great tuner, and be done with it.