NOTE: wrote out a whole post of initial comparisons between my model and the ExoPlaSim and then realized that I was a fool and misread the timesteps. Note for others using ExoPlaSim: timestep 1 doesn't necessarily mean January and timestep 7 doesn't necessarily mean July; for me the hottest month of the southern hemisphere was timestep 4, and the hottest month of the northern hemisphere was timestep 10. Oops!