Well color me interested, 700 MB surplus is indeed substantial. Shouldn't be the case, at least not by my logic (in the end, you should get the -pretty much- same thing with the patched Steam version, just "text changed").
Talking about the EN DLsite version, though, right?
Since you are someone with a legit DLsite copy of the game, could you perhaps confirm that the CGs in the Steam patched version (ergo the one in this thread's OP) are of noticably lesser quality ("not focused right", as the other user put it) than those of the DLsite version, please?
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EDIT: unless uncensored futadikks ACTUALLY take up a whole lot of extra space xD