Seconding the art shop gumstrip method
After years of trying various methods I'm currently having great success with the technique described above where the wet, squeegeed print is lain face up on a large piece of glass (I use a picture frame bought for peanuts from a charity shop- the frame helps keep the glass rigid and makes it easy to handle) and tape it all around with moistened brown gumstrip bought from the art shop, which I also use for the stretching of water colour painting paper. The next day the print is flat, sometimes with a wave, depending on the type of paper, and has a lovely lustrous finish. The brown gumstrip border that remains on the print after knifing it away from the glass I usually leave on, as it makes handling the print easier and makes it less prone to fingermarks etc.
Its become my favourite drying technique for FB.