A sheet separating and feeding system for separating a top sheet from a stack of sheets for sheet feeding, wherein a vacuum feed head has a two dimensional array of multiple vacuum tubes for vacuum engaging the top sheet, and a control system whereby at least a portion of the multiple vacuum tubes are variably positionally controlled relative to the top sheet to engage the top sheet at different levels in a different plane than the external surfaces of the other vacuum tubes so as to provide a variable three dimensional sheet corrugation inducing surface with the multiple vacuum tubes that is variable for different sheet properties.