If a speaker measures perfectly flat, as my engineer (non-audiophile) uncle argues with me to this day, it is technically perfect and the best design, period. I'd bet dollars to doughnuts if most of us heard a ruler flat measuring speaker in our rooms it would sound, um, not good. There are just too many variables other than measured "neutrality" that affect the sound we ultimately hear in our rooms and with our equipment -- and with our own ears. In the end, it comes down to personal preferences and interactions with our own rooms and equipment (and music). So to say it's black and white and one approach is right or wrong is just counterproductive given all the other variables involved. The OP gives every indication with his words that the Sabrinas sound very "right" to him. At that point, who really gives a damn how it measures? They sound "right" to him, and that's ALL that matters. IMHO.
BTW, to the OP, two of my three personal favorite speakers are Vandersteen and Joseph Audio (the third being ProAc), but I've never been able to hear them back to back at a dealer, so personally I'd LOVE to hear your impressions of the Quatros versus the Perspectives. And I think taking a trip to hear the Sabrinas again after hearing those two, presumably with the same music, is a genius move. I have no doubt that hearing these three speakers will be extremely insightful and result in you making a very confident and "right" decision for YOU. Really looking forward to what you hear.
BTW, to the OP, two of my three personal favorite speakers are Vandersteen and Joseph Audio (the third being ProAc), but I've never been able to hear them back to back at a dealer, so personally I'd LOVE to hear your impressions of the Quatros versus the Perspectives. And I think taking a trip to hear the Sabrinas again after hearing those two, presumably with the same music, is a genius move. I have no doubt that hearing these three speakers will be extremely insightful and result in you making a very confident and "right" decision for YOU. Really looking forward to what you hear.