Apart from all the good ideas of the wise people here, I'd like to remind you that he is still quite young. My gelding was the same when he was 4, but now he is almost 6 and has been trained with lots of ground poles and trail riding, and I recently made a note to myself that he has really improved and shows no signs of clumsiness anymore. You can't expect the grace of a dancer from an inexperienced youngster. :)