I haven't yet, I've just gone from 6.2" to 8" but I've been very on-again-off-again. While I do work out I'm the model of consistency but I have long "down" periods where I do no work at all. I don't think I have photo proof on this forum, I don't have a before pic because back then it was all analogue cameras, but I do have a ruler shot showing me to be over 20 cm that I took last year.