Vertical Jumping isnt all about the strength of the legs but a strong core also the core and the legs coincide to help you jump higher some if you doing all these jump programs and still not getting the results you want some of the problems might be your core on the jumpusa.com page there are some ab workout for your vertical that they give you for stronger abs the actual address is
http://www.jumpusa.com/plyoabspecial.htm get yo hops up any other tips give me a hit