Fixitman64

I'm having trouble with impact hammer sensor pods on the Mun. They explode on contact with ground after launching them. Even when launched while landed (on surface not moving). Mounted so launching sends them parallel to ground. It's like the decouple force accelerates them faster than 75 mps? Any suggestion as to what I'm doing wrong? All other instruments work beautifully. I love the animations of universal storage versions!