It is better to prune trees right before a flush. You should also be careful about topping any tree. Don;t take off more than 1/3 at a time. and you need to have a leader, otherwise you will get a lot of watersprouts wanted to be the leader. Lemon trees not always so lanky. Is it in full sun?
Staking has its good and bad points. If the tree is top heavy and leaning it can use some straightening, but a rigid staking hurts the tree in the long run. Trees get stronger by having to naturally resist the wind. The roots have to get stronger as well as the trunk. Staking takes away from that. instead of staking, are you able to build a support cage around it to help it stay straight but still allow for movement?
Happy gardening in Hawaii. Gardens are where people grow.