Lip problem doesn't add much to huffy's roof. 7C+ into a 7A finish. You shouldn't struggle on the finish if you can do the roof.7C+ into a 7B+ is a bit different. Dawid gave it 7C+ when he did the FA, but it has to be harder than huffy's. Anyway, doesn't seem to get many repeats (maybe none?) whereas the easier finish (Detox) has had loads of repeats and lots of people take 8A for it.
I don't get what's surprising here, are you saying they sound the same grade or that the difference should be bigger than 1 grade?
I think a good rule of thumb is....Add the two 'v' grades together add 4 and divide the result by 2
Probably been posted before but covered well in this article I thought. http://www.australianbouldering.com/table.html
The grade dropping correct. Due to it being longer and more stamina due to easier climbing. You have to get the moves more dialed and so it feels easier. This is why such things as lets get ready to rumbleweed gets 8A. But if you add a 7B start to it then it goes down to 7C+