Could you expand on what you did that changed the fit for better or worse?
I tried out as much different positions as possible.
It really comes down to how much distance, either vertically, horizontally AND diagonally is between the drivers and your ear canal.
It's tricky to learn to get it right every single time, since the distance goes in 3 directions. It takes practice and trial and error in positioning to get it right constantly, but I found the below tips to be best for me.
Regardless, with the stock earpads I always found the bass too weak for my taste. But for the stock pads, I found the best fit to be if your ears would be precisely in the middle of the pads, with as equal of a distance in the middle in all vertical, horizontal and diagonal positions of the pads.
With my new Yaxi pads, I find the best sound to be when left-top side of the left pad and right-top side of the right pad, are as close as possible on the upperside of your ears.
If I position the Yaxi pads like I do with the stock pads, the resulting sound is resonant, harsh and distant, though with more bass. However with the above method, it's atleast as smooth as the stock pads if not smoother with just as full vocals but better bass impact and extension.