Delta Values from Previous Day Using Multiple Columns

So... I can't see why there would be a ciruclar dependency error, but my expression isn't QUITE correct either, please update, and maybe do a "plz work, plz work, plz work" dance :)

VOLUME_DELTA =

VAR Yesterday = MyTable[StartTime] - 1

VAR MyMaterial = MyTable[Material Number]

VAR MyElement = MyTable[Element]

RETURN
    MyTable[Volume] -

    CALCULATE(VALUES(MyTable[Volume]),
            FILTER(ALL(MyTable),
                        MyTable[StartTime] = Yesterday &&

                        MyTable[Material Number] = MyMaterial &&

                        MyTable[Element] = MyElement
            )

     )