swap your coercer for an illy you will get way more dps from that, seeing that your illy can use time compression on your wizard and your troub will be able to put upbeat tempo on your illy. If your worried about agro issues the sk wont have much but even then putting tandem from your illy on the wiz troub and illy acts as dehate also yoru troub has a dehate for all casters and scouts. The illy will also give your group haste as well and you can put the tandem on your sk as well but he wont get the dehate from it because it does not work on fighter classes but you will get the proc form it which will help him with hate as well.

Question for you though, why a defiler?