Ben Slavkosky

So I've got this pyro fx explosion I made in Houdini FX 15.0.416 (not indie or apprentice). I followed the “Pyro Explosion Shader” tutorial video to as musch as I could (https://www.youtube.com/watch?v=fTIeGob0Wuo), [youtube.com] but his explosion was made using Houdini Apprentice 13, and from what I've read a lo has changed since then (most notably the Shader looks to have been completely rebuilt and rearranged).

Here's my animation:
https://youtu.be/Awo6XcjLuoQ [youtu.be]

…and my project file if you're so inclined:
https://www.dropbox.com/s/qme0t7qq9lz2xws/Explosion_Test_v2.hip?dl=0 [dropbox.com]

A couple questions:

1. Why does there appear to be a small grid-like pattern on my animation? Did I not set my division size small enough? (You'll see it's at 0.05)

2. when rendering a TIFF sequence, the color/luminance of the frames looks quite different than the PNG sequence (this video was made from the PNG sequence). The PNG's come out much more contrasted and saturated than the TIFF's, and the settings in Render tab are quite sparse, so I couldn't figure out if it was a compression thing or a color space setting..

Any help is welcomed and appreciated, thanks guys!