Petamion isn’t the only thing that drops in 130. There’s at least 3 different gems, ruby, opal, zicron, the knotted armband among the petamion. But the only thing good there is the actual petamion, so no one really likes to farm it. Its more profitable to farm 190 because there’s a lot of good drops there, and because people farm it, most of the recipes cost less.
What’s weird is that max peta recipie is less than petamion recipie as far as rarity goes from the drop, but since hardly anyone has the petamion yet and dislikes farming 130, you end up with more people having max peta recipies instead of petamion ones.
Also if you wanna know since I have both and am either using them or a guild mate uses them, the petamion drop comes from harpy cube only. The venom only comes from the dog cube. So even though there’s 2 different cubes in those dungeons, there is still only a chance with 3 cubes a day.