Yes, I think I commented it as a forever process above. I am not sure if that is a thing but if it isn't, here it is on the blockchain ;)
The balance is tricky indeed but awareness of the system allows an opportunity to discover and adjust more sensitively.
I do think that some are more sensitive to pleasure or fear pain more than others but under the right circumstances, we are all potential addicts of something.
I do not know the James-Lange theory of emotion I actually do not read very much about other theories as I find I am too easily influenced and will defer my own thinking to someone else's. I may be often wrong, but it is I that am wrong and will take the responsibility for it :)