Bring a large pot of water to a boil and add 2 tablespoons of salt and some olive oil. Add the pasta and cook it for 8 to 10 minutes, until al dente. Add the corn to the pasta and cook it for another 2 minutes, until the corn is tender. Drain the pasta and corn together in a colander and pour them into a large mixing bowl. Add the scallions, diced pepper, tomatoes, and lobster, tossing gently to combine. Allow to cool slightly.
In a small bowl, whisk together the mayonnaise, sour cream, lemon juice, 4 teaspoons salt, and 2 teaspoons pepper until smooth. Pour over the pasta and mix well to bind the ingredients. Stir in the dill. Cover with plastic wrap and chill for up to 6 hours to allow the flavors to develop. Check the seasonings and serve chilled or at room temperature.
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