The concept is appealing. I think you've gone slightly wrong with it.
Other than the illegal-ness of the list, I wouldn't take the sniper squads. My main view of WWP was always that almost ALL of your assault power should be coming out, but now that I think of it, it might work to have part of your assault force coming out of the WWP, and part of it mounted in raiders.
To achieve an effective army like this however, your going to need to gear your army ENTIRELY towards assault. So no sniper squads.
Next, just a small point, tone your raider squads down to 9 models total, and add a blaster and splinter cannon to the squad, and possibly adda horrorfex to the raider. That comes out to 174 I believe.
On to the WWP. So far, we have 2 Talos coming out. Since we're only using 1 WWP, we have to be careful not to have to much coming out, or else the army's assault will be TOO dependent on the portal, and will not be flexible enough. 2 talos is too little. We need... WYCHES! So, grab a squad of 13 Wyches I'd say. That comes out to... 207? including 2 blasters, wych weapons, and a succubus w/ agonizer, pistol.
Drop the haemy entirely for now.. So you have about 180 points left as of now, still need to add the WWP back in. I would grab a heamy with a WWP, stick him with a raider squad, and add a 5 man raider squad to give some extra protection:
5x Warriors [1x sp cannon, 1x blaster]
1x Raider [d-lance]
110
I know I know, many people don't like this squad, but I think its well worth it to have floating around to protect the raider that your heamy is riding in.
Soo.. try something like that.
Which means:
Assaulting elements:
1x raider squad
1x raider squad (including a haemy w/ portal, protect this raider)
1x incubi squad
WWP elements:
15 wyches
2 talos
cannon fodder elements:
~ reavers (protect the raiders.. like incubi and WWP raider, if the reavers live, go assault or something)
1x shooty raider
shoot elements:
1x ravager
Something like that perhaps?
Just some thoughts to consider