Homebrew PCBs

I have been playing with the various types of paper I can find 
(coated, shiny, plastic foils etc).  So far I have had the best luck 
with an 80lb plain polished paper (it is quite shiny but no coating I 
can detect).  The combination that has worked the best is preheat the 
board for 3 minutes and iron with gentle pressure (ie a little more 
than the weight of the iron) for 30 seconds.  The problem I am having 
is getting the paper off when I have finished ironing.  If I soak it 
overnight I am fine but I would like to speed up the softening 
process.  Any suggestions?  I was thinking of boiling water but I 
suspect that will soften the toner to much.  Are there any safe 
chemicals that will soften the paper but not destroy the copper or my 
kitchen?

My second question is if anybody knows of a way to get the printer to 
deposit more toner.  I am using an HP 1200 laserjet (which is great) 
but I am getting better results if I run the paper through twice.  
The problem with this is I don't always get perfect registration.

Brian