I'll say that you are raising the bar unrealistically too high.
ID supporters simply use the same methods used in other sciences to detect design, (forensic science, archeology, SETI, etc.) and apply those methods to life and the universe.
No, ID don't use Scientific Method (SM), PERIOD...especially the testing stage of SM.
And it is not unrealistically too high, because the theory of Evolution has already repeatedly pass the Falsifiablity, Scientific Method and Peer Review, the 3 requirements needed for hypothesis to become SCIENTIFIC THEORY, and therefore science.
Other scientific theories, have passed the 3 requirements:
Physics:
- Newtonian mechanism (motion, force and gravity)
- Special Relativity and General Relativity
- Quantum Mechanics
- Particle Physics
- Electromagnetism
- Nuclear physics
Biology
- Molecular Biology
- Evolution
Earth Science
Physical Cosmology
- Big Bang theory (formerly Expanding Universe model)
Each one of these have gone through the 3 requirements, so the bar, while they are high, they are not unrealistic. That Intelligent Design failed, are because many so-called ID experts (eg Steven Meyer, Michael Behe, etc) refused to do the hard work, by testing their claims, rigorously and repeatedly, to verify the explanation.
Falsifiability is the 1st step for any potential scientific theory. You not only need to offer explanation, prediction and maths, the hypothesis must also have the potential of being tested. So any hypothesis must provide instruction of how, where and when to test it.
An explanation that isn't falsifiable disqualify it from being hypothesis, and Intelligent Design don't qualify as hypothesis.