I just got some Alden 401s and found I didn't need to size down at all. I am an 12-12.5 and the 12 D fit me fine as I fit the arch length of the my foot like you're supposed to. They seemed a bit dry after wearing them for a day so I just applied Obenauf's Leather Oil inside and out.
What are signs of oversaturated leather? Parts of the leather lined insole where it dripped down have severe dark spots. How often should I oil them if I wear them heavily? Once very couple of months? Also, How long should I wait for them to dry before wearing them and how long until I put on the Obenauf's LP? Just overnight before wearing and then put the LP on them in a few days?