You made sure to follow only Part 2, correct? All you have to do is set up things through your Nvidia driver and ignore Dolphin's Adaptor option.
At any rate, what Internal Resolution and AA are you using? If it's 1x IR and no AA, you won't be bottlenecked by the Intel HD Graphics for this game (it won't look terribly pretty though), in which case any slowdowns are CPU based. Post your Dolphin settings and show us what you've got set.
At any rate, what Internal Resolution and AA are you using? If it's 1x IR and no AA, you won't be bottlenecked by the Intel HD Graphics for this game (it won't look terribly pretty though), in which case any slowdowns are CPU based. Post your Dolphin settings and show us what you've got set.