I did some B&W bitmap to vector conversions many years ago, though I can't remember what tools I used.
Depending on what exactly is happening now, it might be possible to play with the original bitmap in photoshop to get better results from whatever auto-vectorizing tools you have.
For example, try increasing the color depth to 16 million colors, then re-size the image 400 percent, run a blur filter, and then re-size to 25 percent.
At this point, you'll want to reduce the color depth back to 2 colors, but you might need to experiment with the contrast settings first so that the blurring "fringe" gets removed during the color depth reduction.
I also remember that whatever vectorizing tool I used didn't work well if the source bitmap was too large or too small, so you might want to play around with that too.
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