I've come up with some comp idea. Some of them are going to change the game a little.
1: Behemoths add +3 wounds instead of +6 but are 50 points cheaper.
2: All models can have an armour save and 1 other type of save (ward or regen). If they have access to both then they must choose which one to use.
3: Wizards get a cumulative -2 to their casting roll for each spell they have cast during their player turn. This total is removed during the command phase of a player's turn. Wizards also get a cumulative -2 to their dispel roll for each spell that they have dispelled during their opponents' turn. This total is removed at the end of the opponent's turn.
4: Victory points are awarded per model if they are single wound models or per wound on multi wound models. For example a dragon that cost 300 points and has 6 wounds would offer 50 points per wound lost. A unit of Empire halberdiers would offer 6 points per model killed.
If the points don't divide evenly round down for the wounds and add the difference to the last wound.
For example: A 321 point dragon with 6 wounds would offer 53 points for the first 5 wounds and 56 wounds for the last wound.
A unit of 22 veteran halberdiers with full command costs 191 points. The 22 halberdiers cost 171 points which means you get a bonus 18 points for killing the unit.