hi. i'm doing starting strength, too
my first love is olympic lifting but since i've never done starting strength i thought i should see about maxing out whatever linear progression might be found.
i'm not doing the gallon of milk a day thing, either, but trying to eat up my protein, and follow the program otherwise.
if you have been lifting a bit before starting starting strength then i think there is a bit of a problem in figuring out what weights one should start out the program with.
was that why your deadlift went down? because it took you some time to revise down the weights so you started out with weights that seemed appropriate for the program?
remember... the main point of starting strength is to draw out the linear progression (adding weight to the bar every single time you train) for as long as you can. if you start out barely being able to lift the weights for the required reps then that isn't so conducive to adding weight to the bar every single time you train. it sounds to me like you might have started out with asking too much from your deadlift weights. better to start with them feeling a bit easy and add weight every time you train... i think you end up lifting more that way (because you do still make some strength gains training with submaximal weights - especially if you work really hard on your form and on tightening up the appropriate things appropriately for every rep). hopefully you still have some neurological control / technique gains to be had, too, so even if you start out with a light deadlift you might (though the sheer number of reps you get to do over the weeks) end up someplace better with your deadlift than if you start out with too high an estimate and find very quickly you can't add weight each time.
how about picking a weight for them that feels like work if you work it (if that makes sense). of course it won't feel terribly hard... but then add weight every time you train them.
you might be built to squat rather than deadlift (e.g., relatively short limbs). or you might be cutting your squats high? you might have form issues on your deadlift. i don't know. vids would help. sounds like... you haven't been training your deadlift according to the program, though, with REDUCING the weight on them...