I had the same problem, just grind it out in Ramps to 64.

FYI I had to grind the last part of 66 too before I could go to netherstorm & SMV, did this in BF.

Now at end of 69 I have 25% left and just collection quests to do, so i'm finishing off in mana tombs which is an easy clear at this level and around 120k per hour.