There goes that optical illusion full chisel tooth again.
You wish you could get a little deeper gullet? Deeper down, or deeper back? Still kind of looks like you might not be getting the leading edge of the top plate to feather out- kind of like creating a burr that folds off the top of the tooth as you file- like your gullet might be sharp, but the top plate looks a little dull still- hard to call from the photo- but that is what I see.
Glad you decided to skip the grinder- be not much cutter left after another grind session.
I might suggest next time you are at the file store, buy them in dozen boxes. Your 038 will be running 3/8 chain also and one file will not last forever.
If I were you, I would buy a dozen files and a few loops of low priced chain- practice your hand filing on these cheaper chains, the tooth profiles are pretty much the same and you can get a feel for what you are doing/changing as you file them down- leaving the grinder out of the equation for a while. See what works, what doesn't and how altering the pressure, angle and position of the file alters the results.