Maybe they both have a pretty good leaf spring leak, and that over rides the effect of the differences between them.I'm surprised to see 1/2 so close to each other considering their different construction ...
Get out the chicken bones, Ouija board and the Magic 8-Ball for an answer.... while 1/3 performed quite differently despite being made the same day. I would assume from this that filter 1 leaks significantly more than filter 3. Hard to judge filter 2 here.
