..just to bring this thread up to date - yes, II.(Sturm)/JG 300 went to the Oder front during February 45 - there's a chapter devoted to Sturm exploits in the East in Vol II of the JG 300 history - which was published in French in December 2005 ...not many aircraft encountered in the air - it was mostly ground strafing...
"...One last time our aircraft shuddered as our guns hammered out their salvos. With a deft touch on the rudder bar I was able for a brief moment to ease a pathetic human silhouette into my sight. A short burst and then I pulled up sharply to avoid a tree..."
Karl Rusack, 5.(Sturm)/JG300