You don't need the slight elevation to get that action - just hit as level as possible but slightly lower on the CB.the slight elevation of the butt of the cue ... causes ... A skid and then a roll on most firmly struck shots.
But actually, that skidding is something to avoid unless it's necessary for shape - it's an invitation to CB swerve. An instantly rolling CB (hit above center) is more reliable.
pj
chgo