Ok, here is another denoiser with the Radeon ProRender.
Using the Edge Avoiding Wavelets setup.
I used 5000 samples as the first render above and took 20 minutes to render as the first render above.
There are no longer any dark pixels like the first render but looks noisy and shows streaks.
Im tempted to try an external denoiser but might not even work. Its a denoiser the that comes
with a free photo editor called chasys_draw_ies . It has a denoiser named Wavelet Denoise.