Many traders I have met seem to struggle with taking too big a loss on a trade. I have done it a few times, well actually more than a few times, myself. A few weeks ago, I even watched Andrew do it live in the chat room and it sparked a lot of great discussion. Your situation seems a bit different on the losses bigger than winners though. I think the typical experience on large losses is to keep moving your stop to the next technical level, maybe averaging down a bit because you just cannot be wrong this time, or something like that. Your strategy could be skewed to taking losses because you take profits so quickly. As a matter of preference, I would never take a trade that only had $.10 of first profit target unless it was a very low price stock, say under $1.50. If there isn't more volume and movement than that, then maybe the stock isn't really in play. This is just speculation on my part though.
Have you considered looking at your winners where you took first scale out at $.10 or $.15 profit to see if those exits were at a good technical level like support/resistance, prior day close, or one of the moving averages or if you were just getting out to make sure you didn't lose? Also, on your winners how many losses would you have had if you would have played for a little more profit? The answers to these questions might point out whether you exit too quickly or aren't finding the right entry on a moving stock. Both good to know.