I finally got my textures switched around so everything looked better but
SetReverseFill(true) still didn't really work out for me. I tried to enable it on my player frame to get the bars to fill from left to right, and instead of filling the bars it actually shifted the textures and skewed them as the bar depleted. I tried a bunch of stuff to try to get them right but nothing seemed to work. I'll probably try again either later tonight or tomorrow and I'll see if I can fraps a vid of it.
oUF_Lust is the outcome of it for now.