What about 4 sets of hyper 7 shocks(13mm ones), the rears are 115mm long and think thats about emaxx length, thats the cheap option but buy the sound of it you may be willing to splash out. There are some high end shocks that comprise 4x normal shock with springs and 4x just dampers so no springs, but can't remember the name.
would love to see some pics
Andy