Disclaimer:The advices that I give of any sort are just stated on general laymen's knowledge.
Q: Has your unit ever been larger and it didn’t appear to be?
A: Yes. In a thread titled “Broke it!”, I described how, even though it looked like I had lost size that day, I had actually reached my length goal. Careful and consistent measuring pays dividends. I’ll also point out that, depending on erection quality, my personal EL varies 1.5”.
No new position, and I had just started hanging a couple of days before. I had been stretching and dry jelqing for about a year before that. I’ve gained 1/2” in EL in that time. Little to no change in girth.