Homebrew PCBs

All

I have started using the toner transfer process and it generally works
well for what I make. 

One problem is the track edges. Sometime they are "ragged" , not a
straight line. The toner transfer on the copper is straight, but the
end result is not ?

I use a HP laser printer set to maximum toner and HP satin paper. 

Any hints on why the edges are ragged ?

Thanks 

ShuttleAU