He's changed his batting stance from hands below his shoulders, preset to make his stroke short and sweet. But as his hands were close to his body, it made him vulnerable to inside pitches. He now has a power hitters stance. Hands are high, by his ear until the pitcher starts his delivery. He then moves them back and down level with his left shoulder.
Power is generated thru plant of front foot, wrists and follow thru.
It should also up his K totals as more arm movement leads to more mistiming. But going for him is being lefty in a RHP- oriented world. Hitting FB for .362 is disparate from off- speeds for.032. Righties naturally shy away from breaking stuff to a lefty. Even when used, lefties get a good look at it, take them for balls and are then in a FB count.