I Don't CY.

I've been wondering recently why the self-discipline that allows me to keep kosher throughout the year and avoid anything leavened like the plague during Pesach doesn't carry over into resisting the sweets that I have such a weakness for. I even caught myself wishing that there could be some kind of rabbinical ban that would help a girl out--and then I realized that there sort of already is: Cholov Yisrael.
As I was converted by one of the primary students of R Moshe Feinstein, z"tl, and I have heard many wonderful stories about him, he is someone whom I attempt to emulate (emphasis on attempt). If such a tzaddik trusted in the USDA, who am I to doubt them? Still, I can't help but think of all of the corruption within federal agencies that has been revealed via the media, which I'm quite sure is only the tip of the iceberg. And to add to my confusion, I cannot deny that I'm not exactly coming to the CY table with admirable motives. I'm not striving to further my bond with my fellow Jews, or to erect a fence around the Torah; I'm really just trying to put an obstacle course between Reese's Peanut Butter Cups and my mouth, for purely superficial reasons. Is this an acceptable rationale to take on a stringency?
I'm interested in hearing different perspectives on this issue, and why anyone has or has not taken on Cholov Yisrael. Until I can make up my mind-slash-be convinced, I'll be hanging with my boys Ben & Jerry (Mmmmm).
cbg