Hasta La Motion!

Hallo friends
I am trying extract grain and apply it back on the same image (after defocus)
problem and scenario:
i am on Flame now and do not have scanned grain node

1 i have clean bg without grain,
2 i subtracting it from original bg and have black frame,
3 i am rising offset in CC to 50% (0.5 in nuke) and i have gray plate ‘with some grain’
4 now i trying to regrain my footage
5 question is which mode should i use when i am merging
so far overlay looks not so bad but still this is not good

i able extract only heavy compression of footage but not grain
bwt 🙂 it is d7 :shhh: footage – that is a reason or i did something wrong?
thank you