Just a question... since you've been enhancing a lot, have you noticed enhance seems to fail more often then usual? Because with 15 rune, I only managed to get +8 to +10... maybe it's just insanely bad luck.
This person is nice, responsive, and very accommodating. On request, he provided screenshots for every single enhancement attempt. For what it's worth, I highly recommend this person both as a seller and buyer in Vindictus.