Holy Banana! (⊙_◎)
Haven't seen that post until now.
I will try this out shortly. But I'm pretty sure I'm not the one who can fix this.
Many thanks, Jon.
PS: I butchered wwwmaze's warp preset and added lots of more functions. Will upload in the next days with examples. That's really fun. Even though I have no idea what I did there.
EDIT: The cool thing is, this overlays the blur like a glass plate. It kind of mirrors the left border to the right border like a reflection. Would be nice to use this. But it really gets messed up if you turn the sigma up.
Blur is so much fun. I recently saw a radial blur with offset which looked like an old film effect with only a blurred vignette. Ah, there are so many nice ideas.