I'm an inch shorter than you and after trying several different bars on my road king, I went with the 508's. Yes, they have a wheelbarrel feel but they do a very good job and after several months of using them I would not have anything else.
I have a 2001 Road King, am 5' 6" and for Christmas my wife got me the Chubby 518 bars. I presently have Flanders bars that are 2" wider and 2" more pullback than stock. With by vertically challenged stature slow speed turns has me reaching for the bars, but otherwise I find the Flanders more comfortable than stock.
I was looking at the 508's but have read where the wheel barrow effect is pretty strong and am not sure if 2 inches further back and narrower will be comfortable. I have sat on Roadkings with the custom bars and find the wrist position to be somewhat strange, if not something that I would need to get used to.
I matched up the new bars and they seem to be an inch narrower and an inch further back. Another option I have been looking at were the 513, but don't think they will give me the pullback I am looking for.
Any members out there, vertically challenged, and riding with 508s, 518s or 513s?