There are plenty of better organic alternatives to Gaia Green, there always seem to be questions on this forum from people having issues when using Gaia Green products. Dry amendmants are too vague in their application in my opinion, use quality, organic, cannabis specific liquid fertilizers instead.
B.A.C and Bio Canna are two lines I can wholeheartedly recommend, but there are many others.
Teas feed the soil microbes, not necessarily the plant and are more of a tonic or "stimulant" rather than fertilizers.
Seaweed extracts (kelp) is another fantastic soil stimulant, but the biggest benefit I have found in recent years is the addition of mycorrhizae to the soil, the plants just grow better and fertilizer efficiency goes off the scale.
"Mykos" from Xtreme Gardening is my favourite, but there are others, like Great White Shark.
After discovering the benefits some years ago, there is now no way I would ever grow without adding mycorrhizae ever again!
Yes, monster harvests are possible with organics, something I have been achieving for over 35 years already.