I’m now Lv 252 and I have 20 Lv 11 card maps to do. That’a about 320 Lv 11 cards. So I have now two paths:
Grind Storage from 252 to 267 and then use the 320 cards. That’s LV 280.
Use now 160 cards (half) to reach NOW to level 264 and skip Storage Grind and go straight to Maven Abbey. Then grind until 274 and use the rest (the other 160 cards) to hit 280.
So… the question is: whats more optimal? Grind 15 levels on Storage? or grind 10 levels on Maven Abbey?
I don’t know which way to take.
You can do either. The time to grind on both are averaged 1hour per level on even level mobs.
I would suggest to grind it out till 280 instead or until rank 8 open. There’s no rush to get max level. Your daily mission exp won’t get to waste also.
With Daily Mission exp do you refer to Fedimian Missions? I think they are not worth at all at high levels… too much queue waiting and total exp you get is roughly 10%. If you use that time grinding you get much more Exp.
The problem with grind is that is boring… I prefer using my time doing ET, Salus, PvP, Dungeon rushses, completing adventure journal or collections… grind from 252 to 280 can be 30 - 40 hours… and I want to minimize the time I expend grinding and maximize the time I expend doing fun things 
That’s why I think I’m going to spend all my 320 Lv 11 cards now to avoid grinding, and then when Rank 8 comes play the new map and missions to reach Rank 8 in a month enjoying the way 
just grind don’t even bother use card
There will be new quests from 280 once the cap is raised. Exp reset is also at 281. The exp curve also immediately goes very steep as you approach the new cap.
However you want to go about it is up to you. As for me, I’ll definitely use my cards to get to 275-277 (about the same base level as my job level gets maxed), and then roll an alt (always wanted a squire3 and an alchemist) while we wait for r8.
I don’t have enough time to do grinds so dailies are enough for me. Also, no one needs an Sw3 Cata3 in grind parties. 
I do want them in my PVP party =]
When you talk about dailies… what do you Refer?? Fedimian Daily missions? How much queue time at 255+?
do 3 daily mission per day, spent 5- 10 hour straight grinding i don’t bother do dugeon, just find a party for rush only
dont use cards itllbe awesome once rank 8 released
i will just add this here;
when rank8 was released in the ktos thread, the guy who does datamining have confirmed cards level 12-13 from quests = of 550 million exp, and for rank8 you need close to 700 million exp, he also have put a table about the exp.
so is safe to assume that once rank8 hits, getting class 15, is fair easy since the difference of exp(150 million ) could easily be taken when you are doing the new quests, or just a little more farm, let’s also all remember the new level difference of 40, allowing us to farm lower level map even at 300+.
so i would recommend to use the current cards right now, to take level 278 to max class 15 as rank7, and if you do not get level 280 with the cards, just re roll a alt and wait for rank8, since all you need to do is use some of the new cards lvl 12-13 to get rank 7 class 15 as well, there is no need to rush anymore, because the new cards would give fair good amount of exp, plus the new level difference allowing us to farm lower level map without penalty for a even more exp, just think about grinding exp in those level 27x maps, with rank8 skills how would be fair easily.
You have your answer on what you like to do. Don’t know why you created this thread.
Wow wait… I started this thread because I want to know if it’s better:
Grind 15 Levels - Storage
Grind 10 levels - Mavel Abbey
I never said saving the 320 Lv 11 exp cards as an option… so yes, I knew from the beginning that I’m going to use the cards. My question is where to grind (where are more parties looking for grind, time per level, etc…)
3 x fedimian missions (go siauliai for the exp)
5 x merc post daily quest (one that gives lv.9 exp card per quest) - if the quest seems time consuming, e.g. hunt X qty. of this rare drop, you can abandon it (though its counted for the day) and get another one
You can also still get exp from doing full runs at virtov dungeon (240). It gives decent silver anyways.
Also, don’t forget to do kill counts on monsters you can handle. Some elites require low kill counts so you’ll want to do them as well (others requiring 100+ kills I just ignore). You get some exp and silver doing so.
I’m currently 252 like you and have enough cards at the moment to shoot to 270 if I want. I’m still yet to do quests from lv.253 (steel heights, i just follow the betterquest addon sequence).
I expect to max my job level in a week or two from now. Takes me about 3-4 hours per day.