No need to apologize for your gear. It's perfectly good enough to characterize your product at low levels. Audio Precision are just one manufacturer of test equipment and there have been plenty, and are plenty of other perfectly good test instruments out there with numbers that challenge theirs (Panasonic/R&S etc) They aren't the only game in town, despite what some people would like you to believe. What is more important is comprehensive testing, not off-the-shelf tests with limited data points.
If you want to be different, characterise your products at various loads, frequencies and levels. More data is better than less. Make it a real job for someone to find fault with your rated specifications and be conservative and realistic.
Or you could just just sell a ton of amplifiers and buy an AP to buy credibility with a certain subset of the audiophile community who will only be satisfied if there's that little logo on the graphs you publish. Sad, but true.