if you ask me, you need to take a step back, its weed, not machines, use logic and common sense and learn to read your plant`s instead of charts and daily chores, let em do there thing they know how
if you have a plant that take ages to dry out it might be Bc. you have small seedlings in hugh pot`s ? tho thats just my first guess based on all the info and pictures you provided
J/K
if your in 1-1-1 perlite-soil-coco your drain should be very good, that lead me to ask for your pot`s if they got good drain holes in em ? and how your RH is ?
and what kind of light ? do they grow well ? or is they over watered and out of PH ? that can also lead to stalled growth and no water uptake
if you have issues with over watering look in to hydrogen peroxide/H2O2
http://joemacho.hubpages.com/hub/Hydrogen-Peroxide-for-Plants
can be a real lifesaver
also, about pot`s and plant size, I like to do a few repots, hard to over water a seedling in a cup, easy in the final 5 gallon pot if you want to water probably, common sense, a seedlings root net can not use 2 gallon of water in a cobble of days witch is what I like my plants to use to get dry, once they need water more then every second day I repot em, normally I use Cup.s then 1g then 3g and before 12/12 I use either 5 or 7g depending on size (this also let the plant use all the pot as weed do like to spread out its roots to the side and down, by repotting you fill out most of the final pot)