Well you need to give him time to let down and relax in his new off-the- track surroundings especially if he is racing fit and hasn't been turned out on a farm for awhile. I never used anything more than a medium thickness loose ring French snaffle (2 joints - 3 pieces 2 regular snaffle pieces connect by smaller middle section - not a Dr. Bristol which is more severe) and a flash nose band with my off the track thoroughbreds. The loose ring is good because it will slide and they might not grab the bit as easily. The flash helps keep the mouth closed which also aids in not letting them grab that bit. The double jointed bit puts pressure in areas of the mouth that they aren't used to so they seem to respond better...different feel, different expectations... The worst thing you can do is keep a tight hold on them because then they just want to go faster, also keep you hands quiet because changing holds on the reins is a signal to go faster when they are galloping. Most of the horses on the track are used to being taken a hold of and the hardest thing for a rider to do is actually use light contact because you are sitting there thinking "If I'm going this fast and I have a good hold if I give him some rein I'll end up in the next county." But that is what you have to do ..it works. Have fun they are the best horses in my opinion.
This was a post from the site below, hope it helps. http://ph.answers.yahoo.com/question...8121457AAiXs7L