This tree is too dense and the interior shoots are weak and yellow (first pic). To let more light into the inner parts of the tree, I need to reduce every pair of leaves to one and cut the remaining leaf in half, this process take a good 6 hours on this tree which I have to do over a few days after work.
Before leaf pair reduction 14th May 2016:
After pair reduction and leave cut 23rd May 2016:
And you can see a few weeks later the inner buds start to grow through the canopy 19th June 2016:
Same again next year.