The shrink marks don't bother me at all. It actually makes it feel sort of unique and handcrafted. I don't think it's worth wasting time or resources to fix.
Once I called my ISP because my Internet connection was down. They asked me to reboot my computer. I politely informed them that none of my computers were turned on. They advised me to please power on a computer, so that I could reboot it.
It's the gradient descent algorithm they use to train neural networks!
Just replace "sweet spot" with "local minimum." It may or may not be the same as the global minimum.