Ah, yeah, didn't look at it too closely. Though it seems to have still wanted to follow the general curve at least. I'll try it again later, maybe with slower settings too.
Edit: Here are my latest HCFR measurements on the "Standard" preset, which seems ever so slightly better than CUSTOM1 (Could possibly be down to measurement variations)
Standard:
(Grayscale)
(RGB)
CUSTOM1:
(Grayscale)
(RGB)