First off, thanks for the Doomatter program, really helped out.
Well, it seems you have had simply terrible luck. The drop rate is low (est. 1% in my experience) but shouldn't be lower than that of U13...But look on the bright side, you have 3 U13s! I think you should take a break from U19 and use up your three contracts on Facebreaker so you can try and get more while waiting. Beware: I believe the name of U19 is "U19 (Pet) , so if you want to turn on the auto deleter you'd better include the Pet bit. I'm not even sure of that either, so you're better off sticking to manual. Good luck.
Btw, try to get Chaorrupter Unlocked. (50% dmg boost to chaos monsters) It drops fairly quick and speeds things up because you're going to be farming a lot of Chaos-type monsters like the Gemeralds and escherion. If you are going for AFDL, don't get the doomblade first, get an item that can stack the damage boost on top of Chaorrupter.