Read this historical and historic post. Notice the graphs.
What @LegoMindstormsmaniac found was that a power setting of 85 to 127, the actual delivered power does not increase much at all.
From just below the second presentation of the graph, in paragraph 9:
Because of @LegoMindstormsmaniac’s work, (which others have verified and reproduced periodically) we know you shouldn’t expect to see much if any change from 85 or so up to 127. We often round this to 90, just because it’s an easier number to work with.