Sorry for your frustration.
The power of Endnote is that you can edit a style to suit the particular journal’s requirements. It is, in fact, dangerous to assume that just because a journal style is available in Endnote, that it is exactly correct, as journals change their minds over time.
Editing a preexisting style is pretty easy, although it usually takes a bit of tweaking. When you open the style manager (from edit > output styles) you can view style previews, and try to pick one that is closest. Then “edit” it and save it as a new name. You might then have to open the manager again to select it and get it to display in your list. The PDF manual and help features of the program help with instruction on how to edit a style.
This is primarily a users’ forum and it is really nice that the Endnote techs do drop in from time to time. But there is official tech support which is very good at responding, available from the http://www.endnote.com website. And there is also a style finder (albeit not very user friendly) and more importantly a place to request new styles at http://www.endnote.com/support/enstyles.asp.