If writing audio CD (WAVs) 20x is still too fast!

2x-4x will cause less problems and more compatability with ausio CD players.

If the MP3s play OK on the computer, transfering them to a CD as MP3s shouldn't cause skip.

To check for a transfer of MP3 problem (Burning) -

Play the MP3 on your computer - check it plays OK
Copy it to a CD - check if it plays OK

If it skips copy the CD MP3 back onto your computer and check it it plays OK on the computer.

If the copied back MP3 skips it's a burning problem.
If the copied back MP3 Plays OK its a CD Playback problem