Coleman knows Dallas, he lived there for a while.
One of the guys here in central Texas is about the same size and he rides 10, 14 & 17.
You are proving my point - 14m kite for most winds, 17m for light wind and 10m for higher wind days. So I am wondering why Coleman suggested a 10m for a first kite. That just seems way too small unless most of your kiting days are over 25mph.
I'm curious about kiting in DFW though. My mom lives in Rowlett so I've considered whether or not it would ever make sense to visit her and bring the kites. Having grown up in the area, it seems to me that the winds would be fairly unpredictable. How many kiting days do you get there? Is Lake Ray Hubbard the main spot?