For full Remo line up I would bolt on the following
Nirvana or some form of amino acids help with Calmag absorbtion, create higher brix counts, better cell development amongst other things. These must be L handed acids not R handed acids. Plants can't use R handed acids.
Silica like rhino skin creates stronger stems and pest resistance amongst other things.
Hormones, bacteria and fungus in the forms of pirhana tarantula and voodoo juice. Helps protect against desease and infection, promotes more root growth, creates more root hairs, increase nutrient availability and uptake amongst other things
Sensizyme or an equalivient. Helps keeps root healthy and break down organic matter expelled by the plant which in turn helps the bacteria and fungus.
Black strap molasses in addition to the candy. Feeds the bacteria along with the kelp b vits supplied in the kit which in turn helps plants uptake carbohydrates. Has to be unsulphured. Again little goes along way.
House and garden do some nice things too but pricey. All this stuff is used in very small amounts so 1/4 LTR bottle are more than good enough for smaller grows. Also makes it more affordable to the average Joe.