I don't have any ASFs, but I do breed mice. I use the Van Ness large pans with 1.5. I can grow about 3 litters out to weanlings in a tub with the adults. The bowing in of these pans is annoying. I actually build my slide hangers a little smaller than the pans to bow them in a little. They will not fall out this was but does cause the tops of them to drop a bit in the front and back. I've been using one rack for about a year and have had no escapes. It works so well for mice I built another one a couple of weeks ago like it. I have no problems with the small one getting their water from the edstrom valves. I do also use a rack built with the OddJob concrete tubs that are about 6" deep for mass weanings, but I do use a small piece of 2x4 to help them reach their water (bottles).

Now, all that said, knowing that ASFs are known problematic chewers I probably would not use these pans due to the fact that they do drop a bit in the front and back. I believe that this small gap would be an invitation to chewing, However, tubs with these basic dimensions may be about right for about 1.3 or so ASFs.

Here's a couple pics of my racks.