I think at 181cm we're well into the diminishing returns territory. 173 to 181 is a fantastic boost, but going from 181 to presumably 186 or 187 won't be anything like the same amount of 'gains', socially.
I also agree with G8788. If you look at the height distribution curve, 173 to 181 you are going from bottom 36% to top 24%, passing 40% of all males since you are going from the left side of the normal distribution to the right side. From 181 to 186, you are going from top 24% to top 8%, passing only 16% of all males.
I would only advise you to do it if you
- Are constantly bothered by your proportions. Usually other people will not notice your femur:tibia ratio is off
- Have the money (this includes opportunity cost of not working, or slacking off at work resulting in a worse performance which hinders your chances of getting promoted, etc)
- Have the time (at least 6 months until you can walk somewhat normal again)
- Is okay for people to potentially notice that your torso/wingspan:leg ration is off. I don't know your particular stats, but usually we have shorter arms and smaller frame to start with, and a 13cm gain will make that more noticeable. Though small frame can be somewhat mitigated by gym
A non-concern of yours is obviously pain, because you've already done it once before, I am sure since you are considering doing tibias, you already cleared the mental hurdle of pain.