One strategy for Cold Cuts level 2-3 is to send the Bomb bird just below the very first asteroid, pushing it up and to the left. If done right it should be a 1-birder.
Cold Cuts level 2-2 is very difficult. One strategy is to send a Red bird into the asteroid below the gravitational field and into the icy asteroid next to it. Then launch the Blue birds through the icy...
A consistent strategy for Cold Cuts level 2-1 is to send the Red bird into the top-right icy asteroid. It seems to be the easiest shot that yields three stars.