this is how i do mine 8,8,9,10,11,12,13,14,15,15,15,15,14,13,12,11,10,9,8,8 for a 3ft6" net.
when i increase meshes i always do it at the end of my net and stick to this...when you come to the last loop this is were you want two meshes' add your 1'st do a knot then your 2'nd do a knot...and just keep doing this till you get to your required number. then when it comes to decreasing meshes pick the last 2 meshes up with a single loop and tie a knot.just 1 knot will do for this, hope this make sense
http://s611.photobucket.com/albums/tt199/leeroo7/?action=view¤t=Increasingdecreasin