Which Wintec did you try? I love my Isabell, and it has the changeable gullets. I had a very mutton-withered, flat-topped horse and the extra-wide gullet was perfect.
I wear 7-1/2 C (women's) shoes and have skinny calves, so I have never found any off-the-shelf boots that fit. I have custom Dehners for show. For daily riding, I wear Tuff Rider Amazip paddock...
Me, too! I have skinny calves - okay, no calf muscles, totally shapeless - and wide feet (C width, cannot wear normal width shoes), and am 5' 8". Have to go custom, period. I have resorted to paddock...