To give OEC as a quest reward is not bad idea.
We have 10 bosses in GV, plus 2 sub-bosses at stages 2 and 5.
Each boss and sub boss can give 1 OEC to each squad member.
Or sub-bosses don't give OEC, but last boss gives 3. (To stimulate ppl to still try to finish it.)
I would ask both things together, but I'm afraid Agatio wouldn't agree.

EC drop rate in EPW is already a bit too low, so 12 (14) OEC instead of 9 makes things a bit more balanced.
Also, if 2 or more ppl leave squad GV becomes harder and some more (small) rewards could be included if you still don't fail each stage. Say, more Old Book pages, or Tome pages, or both.
Or just more XP and coins.
