You might take a look at the curvature of the tank, and the stress points, and cut the Tech Spec pad in half (vertically), or even thirds. It might leave some very small gaps in the protector, but it would alleviate the stresses and result in better adhesion.I am not sure if it because of the angle or what it is but I gave up on anything in the middle of the tank. The sides and other areas no problem at all, but that center part of the tank caused me multiple problems.
That may be the best way to get it to stay. I've decided that there are not many circumstances for me that I would be tank down but I may look into doing that.You might take a look at the curvature of the tank, and the stress points, and cut the Tech Spec pad in half (vertically), or even thirds. It might leave some very small gaps in the protector, but it would alleviate the stresses and result in better adhesion.