I think in your case it's a combination of body proportions and deadlift technique that needs fixing. Your squat definitely isn't high, which is the number 1 culprit of squats pushing ahead of deadlifts. As has been said, you're essentially doing a stiff legged deadlift right now, which is holding back what you can lift. You're also probably closing in on the point where you're going to need to switch to intermediate programming in some lifts, and when that happens the disparity will probably stop shrinking.
Thank you Satch12879, and thank you stef. I had interpreted the book incorrectly, BUT not until I'd done over two months of squatting and deadlifting every day. I think I have to admit I might have read what I wanted to - my DLs were starting to feel real heavy. I repent in sackcloth and ashes.
Also, I had no idea I was approaching the need for intermediate programming on ANY of my lifts - I will get PP immediately.
Mr. Blagojevic, this was a helpful article, thanks.
CommanderFun, thanks for the consistent, helpful input.
I just posted my most recent deadlift workset here - at least some of the errors fixed: Deadlift Form Check
Hopefully it will be cleared and visible by the time anyone looks.