So before I say anything, all tips and tricks from the community are encouraged and welcome in this thread. If you think a suggestion is bad don't just flame the person, post why you think it's bad and post a better solution.
My LOW LEVEL method to farming grutins I've been using for awhile now and it's surprisingly good although it can be brain melting unless you truly enjoy grinding. What I do is farm rucco till 100% completion which lands your character around level 11-12. Once you are at level 11-12 you run Control Zone 43 Ep1 (if you want level 4 unique gear) or R Square Ep1 (if you want level 8 unique gear/XP gear) till you cant take it anymore or you run out of EP.
Benifits from doing this;
-It costs 2 EP per run *during this event
-High grutin spawn chance
-Takes less than 1 min per run (R Square Ep1 slightly longer)
-High chance to drop gold weapons/gears
Cons to doing this;
-Should be obvious that there any many cons to doing this as you don't progress your main characters and don't have the opportunity to obtain some high value items which you would get from higher level dungeons
Some extra notes;
-Do not wear exp gears while doing this, you don't want to over level the area because the grutins will stop dropping items along with the boss
-Invest in some gold gears and a weapon for this if you don't already have them because they will pay for themselves very quickly
Mainly this method is strictly for efficient EP burning while going for grutin drops and gold weapons which you can sell on the marketplace or dismantle for weapon upgrade chips.
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Again, feel free to share your suggestions on farming grutins or tell me a better way to farm on low level characters. I'm also looking for suggestions on farming at level 55 efficiently. I also understand some people with think this is stupid to do and I'm fine with that but it works better than you may think.
EDIT: Added R Square Ep1 as another viable option