We don't sell our value conclusions, we sell our credibility.
This is one of those situations where it will really help your reader to understand what's going on if you emphasize the general theme of this appraisal problem: subject is newer as well as being at the upper end of the size range for the area and the value will be at or toward the top of range that you would normally expect for the area.
You can build the foundation of that theme by getting specific in your Neighborhood summary about the composition of the area in terms of age range, size range, and price range. Then if the lot area (for instance) is larger than average you can comment about that in your Site Summary, and then do the same for the building area and the quality in the Improvements section.
At the bottom of the Improvements section there's a question about "Does the property generally conform..." This is where you comment about the home being bigger, newer and higher quality than most of the other properties in the area, but not being an overimprovement when considering there are other properties of similar size and/or quality.
Now you've primed the reader for the gunfight that happens on pg 2 in the selection and analyses of these comparable sales which are also atypical for their immediate neighborhoods. You're not surprising them at the last minute with the complexity of your comparisons or with how far out and how far back you had to go in order to find reasonably comparable sales data. You can reiterate that theme in the first line of the Sales Comparison reconciliation, by which point your reader should be in agreement with your assessment of the situation. Assuming they actually read the report.
Try not to bury your explanations in your addenda, but if you are going into detail in an addenda then at least hit all the high points on Pg 1.