I guess I need some clarification. When you say "short tongue extension" are you saying that the affected chams:

a) have unusually short tongue musculature? (physical defect)
b) they can't or won't try extending them? (injury)
c) when they do try to extend them they can't hit anything (aim)?
d) they can't draw the prey back to their mouth effectively (tongue not sticky)?

The whole cham tongue shooting thing is complicated...eyesight and tongue coordination, the right muscle tone and control, correct hydration to keep the glands on the tip moist so prey sticks to it, eagerness, frustration, and experience. To figure out exactly what the problem is, you'd need to rule out each of these factors. Do these questions help you focus in on the problem?

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