Finally got a merge I like which is very 2.5-2.8D but not uncanny, and it ended up having so many issues.
>If 'blush' is used, it draws blush lines instead of powdery blush
>if teeth are seen, they will not be separated which I think looks cute but weird at the same time
>if wet skin/pussy/whatever is used, it is very often a mess
>probably a lot more I haven't observed yet
But man, I love it for portraits and stuff even if it's not very controllable.