I love Clinton. I use 'cruising' on horses that have never learned to canter calmly. You may not want to do that, though. One horse I had last summer always trotted and cantered like a maniac when I asked it. However, after he was in that gait for a while, he learned he could 'get by' with a slower pace in that gait. Sometimes it took seconds, sometimes up to ten minutes.
I would reward his collection with a rest, maybe a slower pace. Make sure your seat is relaxed and hands soft. Check all of your tack, also.
I got summer hating on me cause I'm hotter than the sun. Win-ter hating on me cause I'm colder than ya'll. I'm being hated by the seasons so forget ya'll who hating for no reason!