I do some light defol during veg but mostly tuck. Once it started blooming I started picking off leaves here and there to open lower buds to some light, improve air circulation (it gets real tight and bunched up leaves are a receipe for mold) and to start pushing the flowering stage of growth engery to the end of the branch. When you cut, it triggers the plants natural defence mechanisms and the plant pushes to fix the damage. In turn super charging everything on that branch.Do you only start defoliating when you're in flower?