I'm probably too late by now, but keep your stealers and hormagaunts away from any dire avengers unless you are attacking with so many squads some are gauranteed to get into assault.
Lictors & others deepstrikers or infiltrators are useful against dark reapers.
Wraithlords can be bogged by a single squad of gaunts.
Dispatch all Farseers you can as quickly as possible.
Try to get into CC with as many different squads as possible to stop them shooting. Lictors/stealers are good for this and can be reinforced by the rest of your army when they catch up.