FInd out whatever's closest to 22/18, as in divide 22 by 18, then divide 16 by a bunch of sizes till you get the closest matching number...
Around 14 is the proper gear, sounds like you may need something a bit stiffer, ie smaller....
Yay, took me 40 minutes....gonna go watch when my cheese breads arrive at my house
EDIT: f**king hell.......that was rather immense....especially Bens wee gap thing on the poiney gadget at the end.....