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This article should help: https://www.gardeningknowhow.com/plant-problems/pests/insects/grasshopper-control.htm

Fruit on most fruit trees will have an off flavor if the tree is stressed. Lack of water or nutrients is the most common reason for stress, so make sure that you are providing enough of these two things. This article will help with feeding your fruit trees: https://www.gardeningknowhow.com/edible/fruits/citrus/fertilizing-citrus-trees-best-practices-for-citrus-fertilizing.htm

How often you harvest really depends on the type of fruit tree you have.

Leaf curl in citrus can be caused by several cultural and pest and disease problems. Under-watering AND over-watering can bring about ‘leaf curl’, so you need to check soil conditions first. Is it too wet or too dry? Wind injury can cause crinkling and curling. Is your plant situated in a location exposed to strong winds? If so,move it to a sheltered location.

Leaf miner is a very common citrus insec tproblem, causing the leaves to distort and curl. It is easily identified - edges curled and a pale green track or whitish lines running over the surface of the leaf. If the leaf miner is your problem, cut off the affected areas. Aphids,thrips and scale can cause leaf curl as well. Do you see an infestation of tiny little insects on the young leaves, or funny looking ‘bumps’ on the mature leaves? If so, one of these could be the culprit and should be treated accordingly. Fungal problems cause leaves to curl, particularly powdery mildew and scab. Powdery mildew can be identified by a white powdery substance on the surface of the leaves. Scab can be identified by the presence of patches of raised ‘rough tissue’ on both the leaves and the fruit. Neem oil can help with both insect and fungal problems. Here is more info: https://www.gardeningknowhow.com/plant-problems/pests/pesticides/neem-oil-uses.htm

I think that a shade cloth is a good idea and would work well to help alleviate the problem. How much shade I would not be very helpful with as I am not familiar with your exact area. I would recommend giving your local extension service a call and asking them what they would recommend. They would know what would be best for your exact area and will be thrilled to help.

Sooty mold is a fungus and can be treated with suitable fungicides, including neem oil. This article will help:
https://www.gardeningknowhow.com/plant-problems/disease/how-to-get-rid-of-sooty-mold.htm

At this point in time, the only thing you can do is to make sure the trees are getting plenty of water and are well fertilized. They need to recover from the damage and making sure they have everything they need is the best bet for helping them recover.