Things seem to be stablizing… falling into place… almost as if I’m begining to get the hang of this, rather than having things slip through my fingers.
reaching equilibrium, althoguh I suspect there’s still a term (or more?) missing, but at least for now, I don’t have to feel out of balance.

have you verified it by dy/dx = 0?
dy^2/d^2x= ? … =X
is equilibrium usually the simultaneous equation solution?
Good to hear!