You'll get different answers to this. Mine is do what you like and try not to make pipe smoking too complicated. You got a pipe, a blend or two you like, smoke and enjoy. Some members stick to rigid rules. Others, myself included, keep it simple. I suspect how you enjoy a pipe is fully dependent on your personality.
So, smoke in the style which you find satisfying. There really are no hard and fast rules. From cobs to Dunhills, used or new, cake or no cake, rigid rules as to blends and shapes, it's all good. Whatever gives you a satisfying bowl is correct.