He needs to lose the obsession with firing his hips. This leads to him having his hips too face on to the target on full out shots, before his shoulders and arms reach their preordained destination. Hence the blocks right.
When he does slow the hips down his shoulders and arms, which usually struggle to keep pace with the Driver, often outrun the hips in his Iron play.
You gonna' tell him, or will I?
After you fix his pivot, get him to stop cocking his right wrist. And tell him not to whine about it.