How do I retain the original image quality when using Trace Bitmap?

I am trying to create an animation using sprites from a videogame. The sprite sheet only uses 103 different colors.

These are the steps I use:

1. I import the sprite sheet (.PNG) into my Flash Library

2. I convert the PNG into a Trace Bitmap using the following settings:

Color Threshold: 0

Minimum Area: 1

Corner Threshold: Many Corners

Curve Fit: Pixels

I've been screwing around with those settings so much but I can never get my sprites to stay the same quality as they were imported. It's as if they become blurred. I've seen other people use sprites from the same exact video game in a flash animation and the quality is perfect.

What am I doing wrong?! Please help, as I am a complete noob (second day working with Flash).

Thanks in advance!