Drill Ideas

, about two weeks ago I changed from some standard "fake grip" to a normal interlock. My driver and irons were fairly consistent but I thought changing the grip could help. Ever since, I have been hooking the ball terribly and I feel the most helpless I've felt in golf. I think the problem is my wrists shifting at the top of my swing. Do you have any drills for keeping the club head square until impact. Or any other drill you think could help for this.