Metal-Archives has not listed them for one reason. They are still metalcore. SCREAMING does not make a band metalcore, they still have poppy choruses (beast and the harlot) and breakdowns, things common with metalcore. If you like them that's fine, metalcore doesn't mean they suck. Please, don't categorize them into something they are not 
 

 -"It's undeniable that they have some metalcore influences, it's just that overall, metal fits better." 
 Metal does not fit better; A7X still does not produce true metal, it is too poppy sounding overall. Yes, the last album was not like the others, and had more classic metal influence, but not nearly enough. Metalcore describes them best, and until they make a complete metal album, they will probably remain metalcore.