gravity doesn't matter on lagers...you NEED a starter, or slurry...or a used cake.
ask the big lager guys/gals here...most of them will pitch 2-3 quarts of starter for a 5 gallon lager that doesn't have a particularly high OG.
time should do a reasonable job of healing this brew. I don't think your ester production occurred at the end/diacetyl rest.
Primary: English Mild
On tap: Pale Ale, Lancelot's Wheat, English Brown Ale, Steam Beer, HoovNuts IPA
Bottled: MOAM, Braggot, Raspberry Melomel, Merlot, Apfelwein, Pyment, Sweet mead, Cabernet
Gal in 2009: 27, Gal in 2010: 34, Gal in 2011: 13, Gal in 2012: 10