You can always top the plant to get it to bush out. Wouldn't want anyone falling off a ladder. I do remember him being an advocate of guano teas. Bats basically poop 2 different forms, there are fruit eating bat and insect eating bats. The guano from insect eating bats are used during the growth phase, the fruit eating bats produce guano that is beneficial during the flowering phase. I will look up the npk differences.