I do not recommend the TF10 reshell. The sound changes and not for the better in my opinion. Its not tuned to be in an acrylic shell and neither is it tuned the way CIEM drivers are tuned when they are placed at specific positions in the shell. Yes even driver positioning affects the sound.
I agree with this. The reshelled TF10 will not sound the same. Some may like it better or some, like me, will not. It's not worth the money to find out if you like the change or not. If you like the TF10 then keep them as is, plus they have better resell value in their stock form. It would be much more cost effective in the long run to buy a CIEM.