I've been painfully forced to accept the fact that I can't open much of a gap between DL and squat (at least for now). I pushed the deadlift too hard a couple of times since I kept telling myself that it should be higher based on my squat. It's hard to make any progress with a back injury though. Now that I've finally quit fretting about the DL number in relation to the squat I've actually made some decent progress with it over the last few months without injury.
Texas method did wonders for my squat. It was brutal as hell, but it worked.