AN's Heavy Harvest line-up are time release formulas, and probably not best suited for indoor growing. They are outdoor products intended for when you want to "set it and forget it" - aka only come back to your crop 3 times in the year.
I would strongly suggest staying away from time release formulas, as they are difficult to control and predict, and provide basically no benefit for indoor use.
If you want to stick with a simple nutrient system, you could try one of AN's base nutrient programs, such as Iguana Juice (1-part Organic), Sensi (2-part), or Grow/Micro/Bloom. Of course, any other brand's products will also work fine.