It's like basically every other nutrient or additive in that the smart grower ALWAYS starts out below what's printed on the label.
I don't care what you're talking about, blindly mixing at the rate on the label is just asking for trouble. Are there products that with certain strain and growroom settings will be perfectly fine at 100% strength? Sure. Should you EVER bet your plants on that if you're not already familiar with the product?
Not in a million years!
Simple answer: ALWAYS START LIGHT.
You can dial it up if you want, but it's much harder to un-burn your plants.
YES!!!!!!!
YOu should always start out lighter than the bottle says.
I haven't used Rhino yet, but I hear it's worth adding to a grow.