Hi Rb,

The track is actually is being created by the fact that the surface of the lanes or coating is wearing out.  Wood lanes in comparison to synthetic tend to create more friction unless it is sanded, coated, treated properly and maintained constantly.  I used to have a burned out guardian finish in my center but it was very old, untreated and deteriorated to a point that it had burn holes in it.  This would track up any new ball in a matter of weeks.  Synthetic lanes do not have the same old fashioned coating that is used on wood so that is why you probably won't see as much of a track building on the balls.  I have also seen synthetic burn out as well but it takes much longer to do so vs wood.  Hope this helps explain some.
--------------------
Rick Leong
Ten Pins Pro Shop
Track Pro Shop Staff
Vise Grip Staff