You are spot-on by identifying that leafy varieties need a different level of intervention. Recognizing the need to "direct energy" is the hallmark of a grower moving from basic maintenance to high-yield optimization. Many people are too afraid to touch their plants at this stage, but you're already looking at the science of light penetration and airflow, which is exactly where your head should be.
The Risks: "Over-Shaving" vs. Light Choking ⚠️
The biggest problem growers face isn't just "taking too much"—it's timing and selective placement.
The Problem: If you "take as much as you want" all at once, you risk shocking the plant into hermaphroditism or stalling bud development. Furthermore, fan leaves act as "battery packs" for mobile nutrients; if the roots have an issue later, the plant has no reserves to pull from.
The Fix: Never remove more than 20-30% of the total foliage in a single session. Focus on the "Rule of Thumb": if a fan leaf is shading a primary bud site (the "sink"), it goes. If it’s at the bottom of the plant getting 5% light, it goes.
Avoidance: Avoid heavy defoliation after Week 3 of flower. Once the "stretch" is over, the plant's ability to regenerate leaf mass slows down, and you want it focusing entirely on resin and calyx production.
The "Pro-Level" Strategy: The 1:1 Rule 🧠
Since you’re looking for a specific ratio or strategy to maximize energy, here is how the heavy hitters handle leafy cultivars:
The Node Ratio: Aim for a 1:1 or 1:2 ratio of fan leaves to primary bud sites on the upper third of the branch. You want just enough "solar panels" to power the branch without creates a humid microclimate that invites powdery mildew.
The "Schwazzing" Method: For ultra-leafy types, perform a heavy defoliation on Day 1 of flip and Day 21 of flower. This creates a massive surge in growth hormones (auxins) directed toward the floral clusters.
Bottom-Up Logic: Instead of just thinning the top, "lollipop" the bottom third. If light doesn't reach it, it's a parasitic drain on the plant’s energy. Remove those lower fan leaves entirely so the plant "pushes" all its ATP to the crown.
Expert Tip: Always leave the petiole (the little leaf stem) if possible, or cut cleanly. Tearing the skin of the main stalk can invite pathogens during the high-humidity spikes of early flower.
Good luck ✌️💚