ZCI= Zero clearance insert.
table saw may give a cleaner cut then... and 60 teeth should probably give a cleaner cut than the 40. DeWalt makes decent blades (ducking), it's what we used when I was flooring, and if we didn't use at least that, the manufacturer wouldn't honor the warranty.
an issue with your score mark may be the relationship to where it is, compared to the cut. if the blade is falling on the score, it is really doing nothing, but if the blade is falling with its extreme edge on the score mark, then you should be in business???