i'm not going to pretend to analyze your swing or give you sound advice because my handicap says i'm not allowed to, but i got the hooks recently and here are some of the reasons why:
-i spin out of the shot and just dead pull it, which sometimes i try to save and ends in a duck hook (rare, balance issue)
-i set up with the face too closed to compensate for my slice (mildly common, setup and grip issue)
-i don't follow through because i don't feel comfortable with my swing (moderately common, too much left hand not enough right hand)
-i get handsy on my down swing (this was my big issue and i'll explain bellow)
i bought a new driver, hit it great on the simulator, hit it great at the range, and still had trouble on the course but it was just nerves. when i was playing it slipped out of my hand and slammed into the turf on a drive. i was so mad that i went the next day and had the grip changed out. i was dumb and got a standard grip put on, even though every other club i own is midsize because i have large hands. i was a sucker for the green lamkin. anyway after playing with a severe pull/duck hook/power draw for 5 rounds and at least 5 range trips i decided to get go back to a midsize. i used the same setup, swing, everything and the ball was flying straight-ish again. no more severe turns in the first 100 yards.
for me because the club feels too thin in my hands, especially compared to every other club i have, i got too much play and too hard of grip on the club and it was leading to the hooks.
again, i'm not saying this is your problem and everything i said could be absolutely wrong. you're a lot better golfer than i am, as is everyone on this site probably, but those are some of the reasons that i've had duck hooks.