A little off of the norm, but I would drop both Punks and Sebastian in favor of Bete and more dogs. The Canine Remains really shine when they attack in packs, gaining their (1) Charge as well as losing insignificant. Bete's versatility cannot be underestimated. Her attack is brutal, she gains Fast very easily, she is a paralyzing machine, and she is nearly impossible to keep down when used properly.
Activate your Canine Remains first to form a screen, as well as forcing your opponent to activate most, if not all of his models before McM or the Belle's go. Use the Belle's to chain lure one of your opponent's key models. McMourning can then do a little Scalpel-Slingin' to get into melee range with the model. Then use his remaining actions to butcher them. Bete replaces a Canine Remain or Belle that is in a prime position, and harasses the enemy's tougher models. McMourning and the Belles continue isolating enemies and destroying them, while McMourning also pops out the occasional Flesh Construct.
This tactic is fairly simple, and is insanely effective. Give it a try!