Just out of interest- I've been riding now for the past 8 months or so and the thing I always ask for on every lesson is to ride a different horse!! I've really found that some have an amazing canter to sit to, some have a difficult canter to sit to and others are like marmite- some people love the canter and can sit really well to it and some people just hate it and can't 
Now the one thing I hate to do is bump around in the saddle and so have worked a lot on sitting well in the saddle, and others now say i look 'glued' to it (although some of that may be owed to my sticky jodhpurs )....Now what I was wondering is....when you are really experienced (like years down the line), can you just get on any horse and sit well to the canter and not bounce?!!!!! or do you still find it a lil difficult on certain horses???
Now the one thing I hate to do is bump around in the saddle and so have worked a lot on sitting well in the saddle, and others now say i look 'glued' to it (although some of that may be owed to my sticky jodhpurs )....Now what I was wondering is....when you are really experienced (like years down the line), can you just get on any horse and sit well to the canter and not bounce?!!!!! or do you still find it a lil difficult on certain horses???