All interesting
I think the He111 should replace the Ju87. That would give each side 3 x dedicated fighters, 1 x ground attack (Sturmi and 110), 1 x bomber and 1 x transport. I agree with limiting the Tiger, it was at Stalingrad 1942 for the German withdrawal in battalion strength (approx 30 in number but this number is hugely debateable ), but it is a tank killer and almost invulnerable to ground attack aircraft. I believe the most prolific German tank in Stalingrad 42 was the Panzer III with less numbers of Panzer IV and Tiger. I think the tank choices are going to be the determining factor in how this goes.