Little help please, slightly confused.

[Greengrower]

quantity of water isn't the best gauge to go by mate, you have to assess the pot as a whole... part of the difficulty is the large pot size, which can stay too wet lower down, and dry out in top areas,.... heft the pot and recall what it felt like when first made up, with well moistened soil top to bottom,... spot watering is fine, it's help keep the lower area from getting resaturated, which if it stays that way for long, can lead to root rot; upper areas can develop odd dry patches too if the water isn't spread around evenly...
Wilting after watering hints at lower root zone being overwatered, suffocating the roots,... time to finger-dig around in there some and fell how the moisture levels are changing top to lower zones,.. set the pots on a small stack of newspaper to help draw off excess moisture by wicking action,...

Definitely some N toxicity starting, so maybe start using bloom nutes with lower N, higher PK %....
How close are the lights? What type/brand? The plants are very compacted, little internodal distances which is not normal, usually caused by a light proximity issue...

I'm not 100% but the clawing may be part of the genetics? Either way here's some pics of her from today.
Dark devil auto

In response, 2 days ago she had a feed, 6L of water with .25ml per L of biobizz bloom nutes, I think she's enjoyed it. I also bought a moisture meter to help me with when to water as I'm struggling with the weight of the pot thing
My light is a mars 600w led, she was about 22inches away but now she's in pre flower I've lowered it to 18inches, next grow I plan to veg with it slightly higher to get a bit more stretch from this strain

 

[Waira]

...not genetics causing that clawing,... Good on the bloom nutes, maybe consider getting a PK booster of some kind, since Biobizz is very mild stuff

 

[Greengrower]

...not genetics causing that clawing,... Good on the bloom nutes, maybe consider getting a PK booster of some kind, since Biobizz is very mild stuff

I had seen other dark devils doing it so was just a thought. Next feed I'm going to go to half strength and hope that helps.
I haven't watered in 5 days and my top soil is dry but my moisture meter is saying the bottom of the pot is still wet. Should I water or not? Also some of my leaf tips are yellowing slightly and have some brown spots on them, what could cause this please?

 

[Waira]

...need pics of new symptoms, but likely suspect is Ca defc.,...
Hmm, fabric pots usually dry much more evenly,... but if it's fairly dry on top, water/feed sparingly... are they in saucers with contouring for air flow/breathing? You can set pots with saturated bottom.s on newspaper for wicking action to draw off excess moisture,....

 

[Gimemy]

Looking at your photos your plants are a little stunted I doubt your roots are reaching to the bottom of the saturated bag defoliate a little bit are the tips of your new growth isn't yellowing it just hasn't turned green yet

 

[Gimemy]

You don't have to go all out
Take half the blade's off a leaf
That will also simulate predatory action if the plant had any genetic defense it will kickstart it and if nuton else let some light in side

 

[Gimemy]

You don't have to go all out
Take half the blade's off a leaf
That will also simulate predatory action if the plant had any genetic defense it will kickstart it and if nuton else let some light in side