Knockdown? Stucco?
I think that's a horrible name for a shot and leads to some of the problem.
I played college golf at NMSU and it was super windy. I now live in Reno, NV and it's even windier. I love it when the wind blows as most players fold up tent and mail in their score. It adds a ton of fun to the game, so enjoy the challenge and creativity of playing a lower flighted ball.
Here's something that has helped me and it should help you.
Don't "knockdown" a darn thing. The moment I stopped trying to pound the oblivion out of the ball with a downward strike, the better my trajectory control became.
Simple thoughts:
Narrow, slightly open stance.
Ball feels as though it's in its normal location.
Choke up an inch.
Take 2 or 3 more clubs than you think you need. (You Amateurs out there try and hit knockdowns WAY too far and get all kinds of ballooning flight)
Lag the club and "wallop with the pivot.
To learn this, hit 5-irons 60-yards. If they get over head-high, you are "adding" or flipping it. Let the pivot heat up the arm swing a bit and watch the ball go incrementally farther. For the AVERAGE BEAR a "knockdown" or "punch" (hate that too) shouldn't go farther than 135. I hit a stock 5-iron 185 yards. I can hit it farther, but don't try to very often. My knockdown shot flies about 150 - 155 and then gets the ground +/- depending on moisture and slope.
Stop TRYING to hit the ball hard. Let the leverage pound it for you.
...and the next time its windy, don't cancel your tee time. Go enjoy it and call your travel agent and tee it at St. Andrews!