I really wish the double bridle wasn't allowed at PC. At the competition just gone, there was a guy in my age group who was on a big bay TB - Quite a nice horse, and he rode in all the classes in a double, except when he had to use a snaffle - Pleasure, Hunter. And OMG! Most of the time the curb was parrallel to the ground... The poor horse had his mouth open in a grimace the whole time and was brodering on hyper-flexion sometimes. And yet he was still placed highly - Sometimes I think a double blinds the judge! He freaked out in a flying change and cantered about 6 steps sideways - Wouldn't stop - Wouldn't keep his body straight when he got excited. When he HAD to use a snaffle, he went beautifully! Maintaining his frame nicely.
And then what really irked me - He jumped AND did the sporting (gaming events) in the double! The horse just about had a fit in one race - His way to deal wth it was to haul on the already over-used curb rein while booting it with his spurs - The horse was making noises of distress and rolling his eyes around/trembling. After a similar situation in another race the horses nose started bleeding. Aargh! And a parent who was timing even told him it was well ridden!
It is so frustrating.