Suddenly hooking the ball?

My game has been at both ends of the spectrum within the last year.  I have had slicing problems (coming out to in), and a couple of months ago I had a hook (coming too much in to out) that I fixed my making my grip weaker and changing my swing plane.  However, after taking a 7 week break from golf I was hitting it right with the weak grip, so I came back to my old grip (which is neutral to weak).

I just went to golf camp for a week for a great experience and because I need to get better for school (I am around a 20 handicap).  I was hitting bit of a fade usually and they told me to make my grip stronger and to keep my left arm close to my body.  Now I have come back and without even making my grip stronger I am hooking it (so I am definitely not going to make my grip stronger as that would make things worse in this situation).  I definitely don't start my swing with my hips usually, which is what I was trying to do today on the course instead of making my grip weaker like I did a couple months ago.  Many balls hooked, but there were a fair amount that went straight and had a nice draw when I started with my hips and lagged.  I was getting much better distance today too, better than usual.

Nevertheless, I need to fix this hook for good while maintaining this draw.  Any recommendations on what I should do?  Should I keep working on my lag or do something else?  If so with the lag, any good drills?  Thanks.

Try this video. Helped me a lot.

u gotta get the lower part movin' first.