Just out of interest do you know which ones specifically are less restrictive?
Rule 27(3) allows an aircraft to fly in controlled airspace without the specified distance from cloud when at or below 3000 ft and at an IAS of 140 kt or less. That one's important for the transition to SERA.
Rule 28 allows an aircraft to fly in uncontrolled airspace out of sight of the surface when at or below 3000 ft. That one's more academic.