The option to remove 3 wolves from the upper limit and add 2 from the lower limit is quite reasonable.
Let's say, 5-6 wolves for Tiras and 7-8 for the rest. The range will be 32-36 instead of the current 30-39. At the same time, the other heroes will also be buffed (24-26 instead of 20-26).
The same applies to Tiras, but the range is smaller. And it's still better to buff the armies of the other heroes not with wolves, but with goblins and orcs.