BITD, the recommendation was 9"-10" less than your leg length, measured by, for example, jamming a book into your crotch while standing with a wall behind you - mark the top of the book, and that mark to the floor is your leg length. The 1"-2" was for prevention of pain and injury incase you had to stop very short and came down hard on the TT.
I'm 5' 7", with legs slightly shorter than average, and I could easily ride a 56. I rode a 58 for a while, and I dumped it only because I came down on the TT hard - but at least some people here scoff at that possibility.
I suspect the 59 is OK for you, though perhaps slightly big. Sizing now has people on bikes that seem very small to me for a given body size.
What have you been riding? If you haven't been riding, is carpal tunnel syndrome a possibility?.