Homebrew PCBs

I just bought a new HP laserjet 1022, 1200x1200dpi.
Using "transparency" option, darkest setting, and best resolution,
using a generic transparency sheet (shiny on both sides), I get lots
of pinholes, and some holes that are bigger. I could repair them with
permanent pen, but I need to do some TSOP boards and I can't allow
this results... so tiny tracks.

Waht could I do? Is this normal? Any paper recomended?
thanks!