Yes, I would agree with doing the Pipe Breathing only when it is needed, and also not forgetting about it when it is needed - which reminds me of the statement (from the Cs I think) of "giving everything its due". There were times at work and at home when I did it when it was needed and at other times I forgot about it when I would have needed it.
I think it also is like nourishing your body with the right kinds of food: If you need to eat, you should provide your body with the right kinds of food in that amount as it needs it.
On an additional note, when I did the Prayer of the Soul recently with a certain kind of attention (or the way of directing my attention) - as if coming directly out of me from depth while providing me directly at depth at the same time - it seemed to be more nourishing and calming than just recounting the words in my head, as if I let something pass by without paying attention to its meaning as has been happening so often. And I think I recognized why the Prayer of the Soul is called thus and that made me feel kind of a calm joy.
I think it also is like nourishing your body with the right kinds of food: If you need to eat, you should provide your body with the right kinds of food in that amount as it needs it.
On an additional note, when I did the Prayer of the Soul recently with a certain kind of attention (or the way of directing my attention) - as if coming directly out of me from depth while providing me directly at depth at the same time - it seemed to be more nourishing and calming than just recounting the words in my head, as if I let something pass by without paying attention to its meaning as has been happening so often. And I think I recognized why the Prayer of the Soul is called thus and that made me feel kind of a calm joy.