Hello DonBones,
Are you happy with the result? Because as I see we have the same conditions. I'd also like to reach 5'11 by lengthening the femurs.
I am not done yet so everything I say is strictly provisional
So far I am very happy, yes. Even at 1 inch I could see a significant difference (a could my wife), likely because my height is at a favourable spot on the bell curve. I (and you) can overtake a considerable amount of men, likely 5% or so, with every cm gained. When I came back to London I had lengthened 2.9cm and even at that point I felt considerably taller, judging by how many more men were suddenly shorter than I. Now at 5cm of course it's even better - I feel like I have an entirely normal height. Even among ethnic whites about half are shorter than I am, which is enough for me
I can also tell you that I had no nerve pains or other excruciating sensations while going for the 5cm, and even without an ITB release did not develop wide legs or duck ass. This means for you that if you go until 5cm you may be able to maintain very good function too, which in my humble opinion is absolutely essential. Moreover, my T:F ratio is now 77%, which means I have fairly long but still normal femurs, which to me is also very important as I did not want to fix one problem by creating another. This is another advantage of a conservative lengthening goal.
To sum it up, so far I am happy and I think you will be too. It will be enough to completely change your perspective, literally and figuratively