Light a grill. Grill the lobster tails over a medium-hot fire, meaty side down, until light grill marks appear, about 2 minutes. Turn the lobster tails and spread each with about 1 teaspoon of the butter. Turn the lobster meaty side down again and grill until golden brown, about 2 minutes. Turn the lobster tails shell side down and splash with SoCo. Add more butter, but not all, to the lobster tails, poking it in the shell under the meat and on top and let cook until the lobster releases juice and starts simmering, about 3 minutes. The lobster tails will continue to lose translucency until a thin band remains down the center of the tails, this should take about 3 minutes longer. Just before removing from the grill, spread the tails with the remaining butter. Serve right away.