I use a suck gate on my 2009 24' Supra which is a similar hull. Our was falling off as well. Here is what I did to make it stick (works perfectly now).
1) I had a small part of the decal which had to be removed. Nobody will ever notice the part I removed. The suck gate must only be touching the hull. Even a small portion of a decal will make it fall off.
2) It often takes two of us to put it on. One person must push it onto the boat while the other clamps the suction cups. It takes all my might to clamp down the suction cup when we do it right. If you can easily press down on the suction cup levers when putting it on, you don't have good suction and it will fall off. You need a second person to really press the suck gate to the boat.
3) work one suction cup at a time. While one person pushes the front of the suck gate against the boat, the second person flip the lever. We have one person on the sun pad pressing the suck gate into the boat and a second person in the water to flip the lever. The person in the water must be holding the surf rope for leverage. If you are not holding a rope, pressing the suction cob lever will push the person in the water away from the boat and the lever will still be open. It takes LOADS of force to clamp those lever when the suck gate is properly stuck to the boat.
4) Make sure you are attaching the suck gate forward and not backward. The suck gate only works in one direction.
5) I find the suck gate should be under water when attaching it. If any part of a suction cup is above the water line, I can't always get a good seal.
Following those "rules", I can get our suckgate to stay put every time.
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