you could do 8cm with the new precise 2.0 and be 179cm which not that different to 180cm and is actually the US male average height.
5cm gain for spending that much money is a bit unjustifiable in my opinion.
You have very little understanding of what LL really means. It is not just centimeters. You will look awkward doing 18-20cm in total.
You will never heal up properly ever again. What's the point if your slightly disabled?
There are many reasons why 5cm is the recommended amount in tibias. I actually regret doing 7cm JUST so that I could reach 180.
Your heels are not supposed to pass your butt if you sit on your knees and this is one of the reasons I feel like I need to do my femurs too.
My wingspan is 180 and I'm not keen on passing my height over my wingspan. It is natural to have a larger wingspan than height. ALMOST everyone has it. Nobody has shorter wingspan.
Be advices to overlook your lengthening goals. After its done, there is no turning back.