I hit a pretty heavy ball, but I really only know what it feels like. To get more or less topspin, I know how to adjust the "feel" of the stroke.
It makes me feel like an idiot to hear you guys are able to tell yourself to contact a couple inches higher or lower on the stringbed, or adjust the face five degrees. Man, I don't know how you guys are able to think and position and detect where you hit so precisely when things move so quickly.
2014 Head Youtek Graphene Speed Pro
VS Gut Mains 16g @ 56lbs / RPM Blast Crosses 17g @ 54lbs