I like to use mostly valks on those open bases, but you need to get to the core. I would take two golems, a few wizards, and the rest valks. Put a golem, a few wizards, and a few valks in two corners to create a funnel. Drop two jumps to the core, and drop the rest of the valks in the center to go to the core. Take a heal and rage to use as necessary. I would probably put the heroes behind the golems to help clear the sides.
You could also likely do an air attack. Use a small kill squad on each AD (a giant and a few hogs will work on three of them, and a golem + wizards + heros on the one by the queen, and take out the queen as well), then clean the place with loons and minions.
