Raise the raid level with various furniture (Hell Totem from Meat Workbench is best, but Furnace has Angry Pots if you can't get Hard Wood yet), and set down some Flower Totems (Plant Workbench) to allow female tribals to join raids. They're strong, like 1-2 shot you strong even if you've cleared the game legit, so be careful. Easy way to power level though.
Also, you can't grab the large tribal females during raids, but you can grab/rape em after you capture them.
Getting like a million Halloween raid spawners is really easy. If you've ever been in the dungeon, you'll have hundreds of Dead Orbs by now, each can buy you a Halloween raid spawner at the Trader. Tons of quick exp/halloween costumes/morale food/tribals to collect. I usually use those to spawn large tribal women.