That is both sad and fantastic to hear. I am sorry that they cause pain, and that you had to change the cable to make them work for you, but I am very happy that you finally found a "tolerable" solution to your issue. I also commend you for sticking with it long enough to find that they are indeed a great set of buds....
If you can find another cable, I would stick with as thin as you can. I think that the weight of the (pretty large) stock cable might be part of the problem for causing pain for you. I personally have found that the stock cable for the Smabat M2s Pro was perfect for earbuds because not only is it very thin, but it is also coated with something like a very very soft cloth, making it so light that I can hardly tell it is there. Normally I worry about a cable this thin for both sound skewing and longevity, but this cable has been great for many years now. Having said that, I know you cannot get this particular cable as the buds have been discontinued, but also because Smabat doesn't sell their cables seperately (I wrote to them asking about this with the answer of "NO"...
).
I have not seen something similar as of yet, but I am always on the lookout. Quality cables this thin are getting rare because the masses believe that the thicker, the better; which I might have agreed with some years ago because thinner cables used to have high resistance values. Newer technologies have enabled cables to be both thin and lower resistant, as well as being sold at a cheaper cost.
As an alternative, don't forget that there is always the ear wings, silicone donuts, and the over ear hooks that can keep them seated and comfortable for longer (relieving pressure):