Grow micro bloom are three separate one part nutrients. Sensi bloom A&B are a two part flowering nutrient. Part of the reason why AN works best, is because they separate different parts to make for a more stable and balanced feed that is easier for your plants to take up, rather than mixing it all together. This separation can also make choosing a line up confusing. The grow bloom and micro line up will work fine for you. On your next run try out sensi grow a&b and sensi bloom a&b and see for yourself the difference.