I think that the most comfortable way to shoot IS with proper form.

When you see pictures of people with poor form, I always think "Dang that looks UN-comfortable"; whether it's craning the neck to see through a peep, or a DL that is too long or short, or a bow arm that has too much bend, or tension in the grip hand. All of these form flaws, IMO, also cause the shooter to feel uncomfortable.

I think comfort and good form are one and the same.