I try to keep a little better product use tally in my head of my fellow 2bers
Completely makes sense about diffusing. My hair dries kind of weird when I diffuse too; so, I have to make sure I only do the roots. I use the cool setting upside down for about 2-5 minutes. Then I tip my head to each side and back and do the same thing. Try that and it might work for you too.

When I use the hot sox I get major frizz.
I had serious problems with plopping for awhile too; and, then I created my own version. I follow the twisting instructions but then I cross in front and wrap around and that has helped with the smooshed crown. I never have quite understood the great lift from plopping. It really only helps my curl formation and keeps it out of my way for a little while. I now diffuse as I described above after plopping. Maybe you could try this method of plopping and have better results; but, if it doesn't work for you don't try to make it work
Looks like we have this forum all to ourselves