With what you have listed above, if you drop the Bushwhackers and one of the light trolls, you'd have enough points leftover to get Champions. Well worth considering,
imo. You don't need the model that gives them overtake (Skaldi) since pMadrak can do that already, I believe. That would make this a pretty imposing brick, with a nice first wave unit in the fennblades buffed by the Chronicler. At some point you're going to want a Fell Caller but I couldn't figure out how to squeeze on in here (perhaps if you went with min Champions, but then I'd be tempted to upgrade to 2 heavy beasts instead of 1 heavy and 1 light).
Are you making your dire troll kit magnetized / swappable? I counted it as a Mauler, but between adding or not adding the Elder to the krielstone, and choosing between the Axer and Impaler (6 or 5 point).
You've got a nice opportunity to go Impaler/Bomber, or Axer/Mauler, for the same total points