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What was making me think there were more than 5 tiers was this set bonus post. http://archeagesource.com/topic/1012-armor-set-bonuses-cbt5/#entry17174
The article shows L20, 24, 30, 34, 40 and 44 sets. According to Entaro the L44 crafted set items are randomly part of 1 of 4 sets. So maybe the sets are outside of the crafted gears normal level tiering.