I have a container of each, size 12 & 14, Mustad up eye dry fly hooks. I bought them accidentally and have never tied on them until today. They are probably 5 years old. I'm wondering what difference the up eye configuration would make on the way the fly floats. Basically, they are identical to the standard down eye design with the exception of the eye. Other than being slightly different to tie on, they are the same. Just wondering if they float differently than the standards.