As to the questions posed regarding fabric softener - it's job is to make things soft. It does this by adding stuff to the fabric - hence the smell, etc. If you use dryer sheets have you noticed your fingers feel a bit oily after handling them? That's what, in much smaller amounts, is being deposited on the fabric. They kill wicking on pretty much any technical fabric IMO.
I have seen demonstrations where membranes like eVent 'breathe' better than no-see-um mesh, but of course this relates little to foot health. Problem with 'breathable' membranes is that they might let moisture vapor and heat escape, but they do not let any fresh air in. This is why non-waterproof shoes dry quicker than those with 'breathable' fabrics - give and take.
I personally am fond of Smartwool PHD Ultra-Lite running socks when I hike in my X-Wing trail runners. When I go into the mountains I use silk liners and the Smartwool PHD lite hikers when it's warmish, and the same liners with a Wigwam silk/merino blend for the cold. I do in fact use a Goretex lined boot - the La Sportiva Trango Evo - when backpacking with a heavier load. (My climbing rig for example - rope, rack, crampons, etc.)
FWIW - I have very hot, sweaty feet. I wear Keen Arroyo sandals year round here in L.A. and can function in Josh winters in the same. Synthetic liners or socks simply do not work for me, even though the science says they should. The one exception to this is when I run - paired with my Kayano's, a good lightweight synthetic sock works great... for about 5 miles. Longer runs I am back in my Smartwools.
I will close by agreeing with other posters who recommend airing out your feet and changing your socks. Lunchtime? Do it barefoot and put a fresh pair of socks on after your toes dry out. Hang the wet ones on your pack to dry and you have a nice pair of dry socks when you hit camp that night. Liners dry amazingly fast so no real need to bring two pair.
Jeeze I'm long winded!