I have an oak sapling, self seeded (or by a squirrel) about 7 years ago. It is now over 2.5 meters (8 feet). It had a pair of leaders at about 1 meter, one of which was removed last year.
In addition to being relatively spindly overall, the top meter is now particularly not vertical. Mostly it has not been staked but it is in a bed with shrubs around, which protect the base from wind. For the past 9 months it was staked vertically with a 1.8m cane, which has now been removed and replaced by the pair of angled canes in the picture (which is almost certainly a mistake).
Any suggestions on how to correct or encourage a better form?