My lungs are clear, and my peak flow is 680+, well above the mark for my height. Yet, even as I measure with these readings, what I have is asthma.
Asthma is a restriction of the airways due to a reaction to irritant factors, exhibited as a muscular constriction or excessive production of the mucus of the lining, or both. Having congested lungs - or not - isn't necessarily related.
Royal North Shore Hospital is one of the Australian research leaders in this area. It was when accompanying my wife to an asthma awareness course run by RNSH some years ago that I learned what my symptoms meant. It took a few years for the local general practitioners and ENT specialists to catch up with the information.
If your symptoms are only occasional, then I suppose you fall into the range called "normal" in reaction to what you put your body through.
My point is this: the mechanism that creates "Pursuiter's Hack" is identical to the mechanism that underlies my particular variation of asthma.
May I make a suggestion? If you have this happening to you more often than rarely, don't write it off as something that goes away by itself. Continued "pushing the envelope" without allowing your body to recover can lead to it becoming a regular occurrence and progressing to a permanent condition. Ask me how I know.
I know we're all tremendously competitive and don't like backing off on training. It is, however, important to listen to the feedback your body is giving you and ease off when needed to ensure you enjoy continued progression and health.