Overwatering?

Purple strain
outdoor
organic
15g pots
PH? i dont want to test ph cause im trying to let um dry.

I know that overwatering is common for new-b's like myself but i was hoping someone would confirm this as overwatering or is it something elese like nitrogen deffiency or me only being able to afford MG bloom fertilizer and its fuckin up my girls?
Will it affect my overall yeild and what else can i do to help my ladies?
Also-
When should i start bloom ferts? as soon as i see preflowers or wait until longer??
Stinkyattic come to my rescue!
BTW the first two pix are of 2 different plants that are in question, 3rd is one that is doing great :D
thanks to all for thier help