Hmm, interesting thread. I decided to run CMBB experiment, July 43, midday, good weather, pretty open farmland. All troops regular. Large map (for attacking scenario, 3000 pts).
15 JU87G attacking 15 T-34M43 (also 10 BA-64B and some infantry, but those were never targeted by the planes). In first trial, defender had 5 25mm AA and 5 37mm AA (290 pts value). In second trial, only the 5 25mm AA.
Results:
Overall impression - the Stukas hit their targets often! However, ...
In first trial, 11 aircraft destroyed (2 for 25mm, 9 for 37mm), 1 T-35 abandoned, one immobile, 2 men lost.
In second trial, 1 aircraft destroyed, 1 T-35 abandoned, 2 immobile, no personel casualties.
Conclusion gamewise - Ju87G is waste of points if opponent is expected to have any T-35s.
However, what would be a historically reasonable level of AA guns? One per tank platoon? More? Less? How were these distributed/deployed, e.g., in the initial Soviet defensive stages of Kursk?