For Ragnahog level 7, we were able to secure three stars and 120790 using the strategy presented in the video below.
First, fire red straight ahead into the flag. He doesn’t do much, but destabilizes the house for your third shot. Next throw Stella up to the middle of the left side of the roof. We use a fairly shallow arc for her. Then Chuck follows on a slightly higher trajectory, activating to kill the Big Pig and start the collapse of the remaining features. When the stove blows, the rest goes! Big Red remains seated for an extra 10K.