i would recommend you go to the lodestone front page and go to the sortable standings. take a look at the victory rates for the different amount of matches played. you'll find adders is actually the dominant GC on primal.

a lot of what you're observing likely has to do with the times you play. some time blocks will have the more experienced players playing together while others will be watered down. i've played in morning, afternoon, and evening before and not only is the experience level different, players are far more conservative and resistant to playing together the later the day gets.