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It sounds like the tensioner is working, since it springs back with good tension. Here's a couple of things I can think of: make sure that the pivot point where the adj. rod connects to the collar is at the 9:00 position (or to the left) when viewed from the front of the engine. (see the photo in the following post) When mounted in this position the adj. rod nut, when turned CW as viewed from the top (i.e. the "normal" tightening direction) will push the adj. rod downward turning the tensioner outer housing, and consequently the tensioner pulley, CCW, away from the water pump pulley. If the opposite is happening, check to make sure that the collar on the adj. nut is under the adj. bracket, not on top of it.
Here's a picture showing the collared part of the adj. nut (coated with silver anti-seize) under the bracket:
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