I know what you do when the df gets to 8pm, you don't offer it. lol I hope you found that funny.
I just recently stopped doing the df with my lo and I did it cold turkey. I tried it one night just to seem, and guess what, he went right through. And for the past two weeks he has done this about 5 out of 7 nights. The nights he wakes, we just give him a feed.
So cold turkey worked well for us. There is another recent post on the board as well about this, you may want to check that one out too.
HTH