Are you sure you are actually having an issue or just don't like the spot you get with these diodes and the higher power lens. Just to make sure you do know these diodes are multimode and have a more elongated output. Check against the info in this thread.
http://laserpointerforums.com/f65/there-something-wrong-my-beam-spot-59400.html
Also if you got the diode in module with lens from me it would not have left untested and can not be in backwards.
EDIT
Actually the best question is does the spot size as you turn the lens in from all the way out decrease in size to a certain point and then get bigger before bottoming out?
Yes, when the lens housing is all the way out of the module, the spot is fairly wide. When it is screwed in, the spot decreases to a point. As the lens is further screwed in, the spot increases in size again until the lens is bottomed out.
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