In the same boat. Only have 35s (been meaning to get 45s!! AHHH!). Anyways, I've never DLed from 45s or anything taller than 35s, so I have no idea how deficit pulling has affected my over all lift in a "true" (for lack of a better term) deadlift.
I think the deficit deads may work your hammies better than conventional DLs though, seeing as how you must get deeper in your stance, so I would assume more
"posterior chain" comes into play (that's based on pure logic, and nothing more though.. So don't take my word for it!).