Thanks, mate. I'm happy about the jewel and the charm (now that I know it's worth keeping)!@sanguillen gratz on drops, they are pretty awesome!
Runes will come, 600 runs is pretty small sample, I did about 3,5k to get that enigma. Usually I bought 60 keys and kept running until I ran out of them. Then i took break and repeated it. Last two LK heavy farming days I did this up to 6 times!
All I can advise is patience. And if you wont drop anything in next 3k runs - hey, u know what? Chances of not dropping for so long are so low, that its pure luck to be that guy who just doesnt drop!
As for Enigma - I made myself a promise a long time ago never to make an Enigma, even if I actually got to the point of having the runes to do it (just my personal preference). I suppose I'd have to see how strong my willpower is if I ever do get that far, but my goal in running LK is to have the runes for a Call To Arms, and then also either an Oath or a Death as a main weapon, and then set out for Diablo and Baal. To be honest these LK runs are mind-numbing to me, to the point of only being able to complete 50-100 at a time before wanting to claw my eyes out. Questing and longer runs are more appealing to me, and I'd like to get back to those once I have the aforementioned items. Though I suppose a Chains of Honor would also be nice....