Hi. Apparently, most leveling guides only work best up until grinding starts. I’m currently 249 and my exp/hour at evac has been down to almost half of the previous amount because of the level gap penalty.
i have enough level 9 exp cards just enough to get me to 252 which is the minimum level for storage. is there a better time to use them than now? when does level 9 exp card start to have less impact?
also, a random pub partymate told me that you can pop all your level 10 exp cards and jump from level 270 to 280. is it advisable let alone possible?

It’s around 120 quest cards+monster counting for Vibora+100% exploration map. That means it’s more than 120+ cards in the end.