health What's wrong with my peppers? Curled up leaves?

I see this on a few of my pepper plants.  The leaves are curled up and there is some salty looking stuff on the leaves but it won't come off with my fingernail.
 

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I usually don't water until the leaves start to droop..  Every few days.
 
I'm only using a 80mm computer fan to keep the air moving. I should buy a circulating fan but the stores only stock them in the warmer months :)
 
They are in 4 inch pots.  I just checked and they are totally root bound.  I don't have room to go to wider pots, so I may have to resort to red party cups.  Thank you all for the help!
 
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