Hey Steel, I don't think this is your problem, but would recommend against experimenting with nutes across product lines, until you are sure you know how they interact. It's better to just stick to the feeding schedule if your selected nute brand, decreasing strength evenly across the board to maintain the prescribed ratio. For AN, they recommend to use the same concentration of bloom, micro, and grow. I would recommend sticking to that.
From what I see, the plants aren't flowering yet, so I wouldn't add Big Bud yet. However, you have a better view.
At this point, I think you may need to switch to a 12/12 light schedule to try to induce flowering. I had the same issue with my first grow, and had to treat like a photo for the rest of the grow.
With this stuff, less is always more...
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