I am no expert on this, but your post intrigues me. One thing that did strike me is that you do see this with some other hets. For example, in the ball python world, if the snake is het Pied, it will most of the time have the tell-tale markers on the tail. So, it is entirely possible that there is a trend with certain genes and traits when the animal is carrying those genes/traits. I am not sure why, and it definitely doesn't show with a lot of hets. I have heard some theories out there. Something to keep an eye on. Take care!