They are all good questions, my plants are 15-19 Brix and I still have problems with borers. No problems with other pests though, which means these will suck on your buds no matter what. However I find less and less of them, and they maybe attacked two bigger colas in total. The rest are middle or lower colas, cause they have trouble going through thicker upper stem. The bigger the plant the less this problem will be felt I think. Also when you catch all the eggs they leave underneath the leaves you'll have less problems with larvae, but you have to inspect your plants often. The worst is when you have corn fields around like me cause they'll just swap from corn to cannabis, and until crops are gathered they will be breaking your balls. Spinosad supposedly works great as organic control against worms, and I'm gonna give it a try next year. It also depends on the year how big their population is, and on the variety of course. They usually prefer indicas or indica-dominant plants, but if they're plenty they'll attack anything. The only plant they left alone in my patch is a Mexican landrace sativa, so maybe there's something about it