hmm... how about a mixed SD set, I know it's odd, but if you think about it, most of the things Blaziken will be hitting with Fire blast over HJK will be physically based, i.e. Skarm, any other steel wall, etc. and HJK packs enough punch to break through anything not resisting it. If you run that with Stone Edge, there's not much to stop you, and you already hit hard from both ends of the spectrum. 
Oh, and will people stop insisting Blaziken has to use a boosting move. He works perfectly well with absolutely no boosting move, if people even bothered to READ THE FUCKING OP, we already have calcs for a mixken posted, which does a shitload of damage WITHOUT ANY BOOST. It can handle everything it needs too with 4 moves on a mixed set. However, I still maintain that it suffers 4 move slot syndrome. Yeah mixken is nice, but i wouldn't mind having a boosting move for late game, and protect would help against revengers, so yes, it does suffer 4 move slot syndrome.
Sweeper does not mean boosting. Things that are choiced can be sweepers, so no, a cheer up set is not better than mixken for sweeping, it just wastes a turn setting up for no significant KOs