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This article will help you determine whether or not your plant is still alive: https://www.gardeningknowhow.com/plant-problems/environmental/how-to-tell-if-a-plant-is-dead-and-how-to-recover-an-almost-dead-plant.htm

I would give it through spring before cutting anything off. There are several reasons that this could be happening and weather is a big factor in that. If by spring they have not unfloded correctly, then go ahead and trim off a bit.

Mature trees (approx. 12 yrs.) typically reach a base (or trunk) diameter of about 18-24 inches. Yours are still rather young so this shouldn't be an issue, though they could have been planted too close to the barrier. If this is the case, you can transplant them accordingly. You should also take into account the spread of its leaves, which will be about 15-20 ft. Make sure to get as much of the root system as possible when moving.

If it was over pruned, there may not be much you can do for it beyond giving it good TLC and hope for the best. Over pruning a plant can send it into shock and that sounds like what may be happening here.

Make sure it is getting enough water and you mat want to try a dose of sugar water to give it a boost (but only do it once as too much will kill it). Fertilize it with a balanced fertilizer.

As a precaution, treat the plant with a fungicide, just to be on teh safe side.

It may, but it is more likely it will not. That kind of damage will be difficult for the plant to overcome and it may be easier to start over with a new tree.

They are easily controlled with a variety of products, such as Neem oil. This repellent is toxic to the weevil. Also, permethrin (Eight) or carbaryl (Sevin) will work. Rotenone is an effective botanical pesticide.