I haven't been using a "low deflection shaft" although my shafts don't defect much because they're app. 12mm. They will deflect a "half ball" on a 9' shot (end rail to end rail or thereabouts). The touch of inside brings out a new perception of the cue ball that encourages a "cut" so it's not all about defection, it's also about utilizing the '3 Part Pocket System'.
Play Well, my friend, let me know after you watch TOI if you have any questions, I'd recommend watching it 3/5 times to absorb some of the more subtle info.