All I do on the game is line the corner up as usuall, lift, turn, hit the power before the bump and it should drag you round. Take some curb if you have too.
Use your ghost as an idea of how much faster you are, remember it's about coming out of the corner fast. Not into it...
We are both on gt5. I think 2slow is on gt6 with different mods to gt5? You mention flat floor etc?