Based on the discussion, the idea of increasing the battle time seemed reasonable to me. Most players play battles at a good pace, so the density of action shouldn't suffer. So, let's try 1:30 per battle and see what happens.
Regarding the restructuring and limitations on heroes, I don't have a strong opinion, so if you gather N = 1/3 of the participants' signatures in favor of your version, I will change the rules in these areas.