Hard brush /w lowered opacity + eye dropper =
(literally 5 seconds in pscs so don't tell me "wow but I can see striations" because you have c o n t r o l when you do it by hand so you can reduce them as you want)
That is my preference. You can control it exactly how you want and tbh smudge looks the way it sounds, like a smudge.
IMO you will get a lot better if you stick with the above method.
ps