How long have they been in the same pot? Before their next feeding, when the rootball is kinda dry...carefully slip it out of the pot and see if they are rootbound. If so...they need a transplant into a larger container.

If leaves are showing stress, it's usually a good idea not to force-feed 'em. (spraying)

Are you using a color-coded test kit? if so, I doubt your runoff ph is that high. The tinting of the runoff skews the color-coded results. Likely it's a tad lower. Keep your ingoing numbers near 6.8 or 6.9, and you should be ok.

Sugar won't give you the results like unsulfered molasses will. Sugar as a stand-alone additive is unacceptable, unnecessary and potentially harmful to the ladies. Also it attracts bugs and insects.

I'm a firm believer that cannabis grows better, stronger and healthier with a dark period. I've tried both and always am underimpressed with the plants that recieve no dark periods. There's a thread around here somewhere that shows how to increase females through light manipulation during growth phase. Were I you, I'd find that thread and have a look.

Would be nice to have a picture, but might be overwatering too. Yellowing with 'sores' on the leaves is usually either overwatering (in the growth phase) or they need calcium. (in flower phase)

When you OD on your base nutrients the leaf margins crispify, and leaves tend to yellow as the nutrients get locked-out. (more extreme cases) A good flush and a nutrient adjustment (less often or less nutrients) clears that up.

The claw is uaually either ph swings, rootbound, overwarering...or a combination of the three.