OK... I did 810 for 3 months and losses were slow, but still, a stone and a half went that way. Nobody was more amazed than me to find a further 2.4 lbs went in my fortnight of 1000. Now on 1200, who knows what will happen. I totally see your point and know how important goal is. I feel much the same as you about it, and am determined never to go back.
Maybe consider a week or fortnight of SS to speed losses and then switch back to 810? Don't know what to suggest. Depends how long you have been on 810, if it's only a short while, my guess is your body is adjusting and you will get a whoosh soon. That's how I seemed to be, If not... well, CDC advice needed I guess. Keep on keeping on honey, you are so close now.
xxx