Congratulations!
Just out of curiosity, how did you mange to achieve such an impressive result (did you already have longer legs/high flexibility or special conditions like achondroplasia, etc.), while others only achieve 8-9 at best? Did you just have more motivation or is there something exceptional with your physiology?
I myself am considering to lenghten 12 cm with the same clinic, but I am worrying about not adhering to the 8-9 cm limit. I don't really understand how that works. From your personal experience do you think that there is no such thing as 'natural static limits', and you just have to work harder every cm you gain more? For example, if one patient went through a lot of pain (you can say, went over his 'natural limit') to achieve the same gain, while the other patient almost had none, do you think the complications for the one who went over his natural limit will still be manageable, but with relatively more work? In simple words, if a patient achieved a certain amount within their limits, does that imply that all patients can achieve it, even if it may not be within their natural limit, but with relatively more manageable difficulties?
Also, well, you can always say everyone has different limits, but I don't believe there is a fundamental/major differences in bone/tissue parameters within a similar age group of people of certain height (if you accept that you didn't have any special physiological conditions like increased bone density, unusual muscle flexibility, etc. that could have made your achievement easier), unless I am missing something, so please correct me here if I am wrong.