Since orcs are very powerful late game with the bloodlust, the idea is to make humans a proper early game race with some minor unit stat changes and make Human vs. Orc win rates closer to equal than now, while not making the game feel too different than the original, and while still retaining Orc's late game power, by applying these changes to some of the most played melee maps.
Here are the changes for Humans:
Footman : +1 Basic Damage, +1 Armor
Knight : +1 Piercing Damage (extends to Paladins)
Paladin : +2 Armor (so that upgrading to Paladins is actually useful)
Ranger : +1 Basic Damage (not the base Archer)
Dwarven Demolition Squad : 520 Gold and 200 Wood (down from 700 Gold and 250 Wood)
Blizzard spell upgrade : 1500 Gold (down from 2000 Gold)
Mage : Start with free Flame Shield spell as well as Fireball
Here are the changes for Orcs:
Ogre Mage : +50 Wood more expensive (800 Gold and 150 Wood, also not the base Ogre)
Berserker : +1 Basic Damage (not the base Axethrower)
Raise Dead spell upgrade : 500 Gold and 50 upgrade time (down from 1500 Gold and 100 upgrade time)
Death Knight : Start with free Whirlwind spell as well as Death Coil
The maps are:
Garden of War,
All You Need,
Forest Trail,
Forsaken Isles,
Great White North,
Mud in Your Eye,
Plains of snow,
Rose Petal,
Schwartzwald,
Taiga.
You can find the maps in the attachment.
Let me know if you want any other maps, or if you want some changes to make the winrate more equal.
Edit: Edited the rebalance maps.
