Yes it's documented, German fighters dragged aircraft to flak batteries.
No, I am not talking about flak batteries. I am talking about mobile AA platforms wandering around the wilderness.
Dragging to fixed flak batteries is covered in AH by dragging to, or hugging, the AA at airfields and towns.
I see no way that a pilot in WWII would unerringly know out to 6,000 yards where a Whirbelwind was.
FWIW, the fix is easy. Limit the friendly icon range to the same distance as the enemy icon range. That would retain the Storch's usefulness while fixing the gamey, fight avoiding, "drag to the Whirbelwind so said cockroach can clear my six" tactic.