Right, I think he's brushing a bit too much. W968 + H3 is made for very thick contact. The W968 naturally creates an arc when you're hitting the ball. That's the biggest adjustment I need to make when I switch between the W968 and the Vis. Hitting too much into the blade with the Vis will result in too flat of an arc, while brushing too much with the W968 makes too high of an arc. He's got good technique, I think with a bit more experimentation with a thicker contact using a more forward and less upward motion and he'll be able to appreciate the difference a lot more.Decent level of play but why do you expect W968 + H3 to perform well if you only slightly brush the ball? Both these blade and rubber require strong forward motion and body strength, while you play like it's Viscaria + T05.
Plus, you also tend to put the ball with a high arc closer to the edge, which is naturally (at least for H3) the least spinnable variant of the ball.