S/H not working to well for me.

[Ray]

Kelp and EM-1 are used for totally different reasons.

Kelp extracts - and they vary greatly in performance, based upon species used, processing and age - are intended to stimulate growth. Those that are high in active auxins will be best for stimulating roots, and one (KelpMax) contains lots of other nutrient building blocks and other plant growth regulators that provide much broader enhancements.

EM-1 is a biological inocculant, which would be expected to protect the plants by predating pathogens and exuding antibiotics into the potting medium, as well as "beefing up" the plant as the population builds within the plant itself.
According to the manufacturer's website however, it only contains one species of beneficial bacteria. By contrast, Concentric Ag's Garden Solution product contains more than a dozen beneficial bacteria and fungi that provide a much more "broad spectrum" treatment, and courtesy of the beneficial fungi, can convert and absorb nutrients from throughout the potting medium (not just where the plants' roots are) and pump them directly into the plants. It's also 2/3 of the price!