Fluctuations In BPSFL

Been at it about 7 mos. And I can verify at the very least 1/3” increase in BPSFL. Any earlier growth could be attributed to measurement errors. But I’ve noticed it can fluctuate by about a quarter of an inch. And especially following an intense stretch it seems to retract by 1/4”. I wonder if this is some kind of protective measure to prevent the same stretch from causing further damage. Also I wonder is any work is being done if not pulled to full BPSFL length?

I feel like this is why a piss pull can be such an effective practice. Because each time you’re pulling on relaxed tissue and are able to pull to full stretch. Seems like it only take about 5 - 10 minutes to relax but I haven’t done any exhaustive research.

Has anyone else noticed this? And can this be used to maximize gains?