All pictures were taken with my 18.5mm wide angle lens so the actual size is 0.5" - 1" larger. Next time I'll lay them on my ruler for a more accurate measurement if I can stop them flopping around.
Very interesting to see that all of them are particularly 'tall'.
I have several the same sizes, apart from the 13" my largest is 11" but none of mine are close to the height of yours - some almost look round lol!
Do you think anything specific in the diet you feed has encouraged the vertical growth?