I'll defer to more veteran growers but I know that different varieties are different obviously. And I know that your NPK ratios can effect flowering/budding/fruit such as if your overwhelming your plants with Nitrogen then your pushing them to grow more green than anything else.
Otherwise I don't know what else would really be affecting your plants...
I personally would hit them with something like the old Bloom Booster by Miracle Grow and see what happens but it had a ratio of 10-52-10!
Al
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