Homebrew PCBs

I am having the most difficult time trying to do toner transfer on 
some circuit boards.  I have tried 15 different papers including a new 
batch of Pulsar paper which isn't working either. I changed out the 
toner cartridge on the printer.  I have tried about 15 different 
settings on my iron for different temps.  I tried 3 different laser 
printers (all that I have).  I just cannot get toner to stick to the 
boards.

I have tried scotch bright, 400 grit paper, 600 grit paper, 1000 grit 
paper, and 1200 grit paper.  I clean very thoroughly with acetone, I 
don't touch the copper after cleaning, I don't touch the paper after 
printing.  

I am stumped and getting really frustrated - grrrrrr.

Sorry, had to vent.

Chris