Hi. Id say to up your watering in both amount and frequency at this stage by maybe 25% at least. If your leaving them 5 days in between watering I'd want to be really soaking them so they run off before then letting them dry right out. check your run off and aim for the Ph to maybe be a tad higher, if its a lockout that's the first thing you want to be sure of . They look like they are hungry for some nitrogen your right , towards the middle/later stages of veg you should be increasing your N levels and cannabis isn't a tomato it's gonna want more N than that , although tommy ferts are actually a good additive in my experience . I'd be feeding 2/3 times a week at 4months into veg At least up your nutes a bit and inspect results. Also get right down on top of them after watering till run off and have a good look for any little critters that might be pouring out with it. similarly have a good luck at the base of your stem and under side of your leaves. If youve got something living in there that could be effecting your plants uptake also. If your unsure about whats happening in your root zone and if they have an uptake issue. Add a nitrogen feed to a PH'd foliar application and spray at lights out . If they respond well to that you know that it's gonna be something amiss in the roots. None of this gospel as i'm not a vicar , just what i'd be looking at in your shoes. Hope they pick up and gain a bit of vigor , good luck.
CS
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