1 and 2: Here's our local weather girl who's about 5'6 - 5'7 with a nearly 6' wingspan. Does she need LL?
First, she's a free woman and can do whatever she wants, so I cannot say she "needs" LL or not; additionally, women are free to wear high heels (despite it destroying their vertebral column), which give off an illusion of longer legs.
Note: She almost always wear one in all her Instagram photos where she's standing upright, else she's doing the ballet feet pose (same result).
Were your femur and tibia measurements done by a doctor, preferably on an x-ray? Quite often people don't measure their femurs properly on here.
3 and 4 points may be the reasons, but it needs to be determined on the x-ray
For the femur: I measured from the greater trochanter to above the patella
For the tibia: I measured from bellow the patella to middle of medial malleolus
(I can do it since I'm a medical student after all)
Next step will be the x-rays, way more accurate, I postponed it because I recently did a chest-CT (so I'm avoiding radiation at the moment)
4: Great reason to do LL. Go for it.
Okay, can the "Stryde nail" method be used to lengthen a leg more than another or the nails are synchronized?