I've gone back to the 40W bulb and it works so much better. I can set the dim level to anything, and it performs beautifully.

Now I have two more questions for you kind folks:

1- What's with the buzzing? So many of my light fixtures let off this buzzing noise that seems much more pronounced with the LED lights in them. What's going on here? It's not as bad when the light is at full brightness, but when it's dimmed it's really bad.

2- Does anyone else dislike the color temperature of a dimmed LED bulb? I feel so set in my ways, but I guess my brain just likes the additional warmth of a dimmed incandescent bulb. It looks like LED bulb manufacturers know this, and I've seen at least one Cree bulb that claims to offer that behavior. Anyone else feel this way?