What's wrong with my hops

I just started growing a centennial and a cascade this year in 2 half whiskey barrels. In the beginning I was over watering my hops and got infested with fungus gnats all over the soil so I stopped watering for about a week to let the soil dry out. I was feeding them an organic fertilizer every Sunday as per directions and watering 2 other times than that. Now I haven't given them any fertilizer in about 3 weeks and only watering 1-2 times a week other than rain. The soil is nature's bounty organic potting soil with worm castings mixed in and I added some bone meal. They had a very fast start to about 8 feet but now the leaves are not looking good. Is it possibly the over watering, under watering, the fungus gnats or a deficiency? I did just buy beneficial nematodes to get rid of the fungus gnats larvae and will be putting that in shortly.

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