Originally Posted by Mig

Your reach is 68 inches?!

Nah dude, it should be a lot higher for people at your height. I'm guessing your reach is measured by standing next to a wall and extending your arm up? So someone at 5'9" should have a standing reach height of 85-90 inches.

I'm 5'9" and my reach height is 88". With the amount you're squating I think you are well on your way to a 40" vertical. There is probably just some activation work at the speed end of the training zone which could complement your strength base very well.