You're right in saying we can't expect 100%, but I certainly think we should be able to expect all the agencies or departments that agree with your recommendations to be on the path to meeting their own commitments. To have 25% of them not doing so is deeply concerning.
Aside from bringing them back and asking them tough questions and presumably and hopefully embarrassing them by their lack of action, what do you think needs to be done by committee, by yourself, or by Parliament to hold people to a different standard? While we can't expect 100% to have fully implemented recommendations, we should expect 100% to be well on the path to implementing what they accepted as your recommendations.