After I typed my message below I realized you said banannas
I typed a message related to hermie balls then bananas.
(Note: I don't top my plants, might be different if topped and I start from seed, might be different for clones)
Ball Hermies:
Most cases of hermie balls I've dealt with would usually be on the lower branches when they were not a severe problem. If a plant I had hermied more than that I'd get rid of it. If it was just a couple of balls I'd remove them and watch for them, they usually show up between week 1 and week 5 in flower then stop showing up. I've removed the lower branches when they were bad, If I was removing one or more lower branches from a tree I would try to space out a couple of days between taking each branch off rather than chop a few branches on the same day. Also watch out for hermies the full length of the trunk they like to show up on the middle of the trunk.
Hermie bananas are different than the balls and shaped like a banana, I've found bananas to show up at the higher levels coming from the inside of the bud and will often be on the larger buds getting lots of light usually bananas show up after week 4 or 5 into flowering