using the @symbol is not the trick fyi, over time more and more mods will probably get installed and it`s used to keep them in 1 overview inside your arma folder
the launcher will find them regardless of the @
read this also : http://www.armaholic.com/plug.php?e=faq&q=18
don`t know if it will help you but it did for me
go into your msconfig and change the number of processor`s on startup to two (or three or four ,wich ever works best )
you have to rename the pbo`s
buildings.pbo to CAbuildings.pbo
desert.pbo to CAdesert.pbo
misc.pbo to CAmisc.pbo
+plants ,roads,rocks,sara,saralite,signs
not completely perfect but it works
don`t know bout the other islands, hope this helped