There have been so many threads about this...
LK doesn't affect it whatsoever. People have theories that it does, and that DA does, but it doesn't. It depends on your real life luck. >: I've tried peoples theories, and they never work, I get good comps and bad. But usually it's in the middle.
here's another thread pretty much about the same thing. There's others but I don't feel like digging for them Dx