[Goat Blower]

You're not measuring deflection between the top of the timing gears, are you? Normally on other belts like the alternator belt, that's how you check it, at the center point between the two farthest spaced gears. On the timing belt, you measure the distance between the outer most point of the tensioner arm and the top of the tensioner body itself. I usually measure it with a drill bit, since it's about 3/8ths of an inch if I remember correctly. Setting the two dots on the tensioner pulley to 10 and 2 will get you right on 90% of the time, or damn close.