Firstly, check out this Wiki:
http://pullmyfinger.wikispaces.com/The+Viktorias
It's one of the best tactica resources for Malifaux.
The "Twin Dancers" are the Coryphyee. They're part of Collette's crew, but Ramos can run them just fine as well. Their main weakness is that they don't have many wounds. Also remember that your opponent is paying 14ss for the duet; it's scary but also expensive. Their main weakness is, amusingly enough, close combat. You can't charge them, but if you get in
CC with them, they get hurt. You will likely hurt anyone you
CC. Also note that Collette's crew isn't very good at doing damage aside from the Coryphee.
I have trouble against Lord Chompy Bits myself. It does tremendous damage, and heals itself a lot. His main weakness is that he purely relies on an alpha-strike mentality. He has low defenses, and heals himself when doing damage (I believe). Activate all your lesser-important models first and forge your opponent to slingshot hompy towards you and summon all their nightmares. Once your opponent has activated, stomp them. Also note that Neverborn generally have no way of circumventing Armor.
The Ortegas are all ranged, but Perdita herself has an absurd 8 defense. Focus on the individual members of the crew first and ignore Perdita mostly. Perdita doesn't really hurt THAT much. Nino (the sniper machine gun guy), I've found to be the most annoying, because he stands back at 16" and pokes you. Kill if you can. Use the terrain to your advantage and force them to come within melee range. The Viktorias should easily take care of any Ortega in melee. Note that your trapper will be of limited use here because you're shooting at an army that can outshoot you. Maybe you can get cheap shots in and kill Nino, but Perdita's counter-ability will be problematic.
If you're into netlisting, the Outcasts are one of the stronger factions. Leviticus is really good if you are meticulously into this game, and Hamelin is arguably overpowered. Don't let up on Outcasts just yet.
Von Shill is rather good, but he's a bit expensive for what you're using him for. If you want a mobile objective grabber and/or sniper, why not use the Freikorps trapper only? The Infiltration alone oftentimes makes it worth it. Take two if you can/want.
As for using the Viktorias, you have a 0
ss cache and your models are essentially glass cannons. Keep some
ss in reserve for use in defense and learn how and when to use them well.
Pick your schemes well. I'm not too familiar with Outcasts' schemes, because I play Arcanists almost exclusively.