Coalition Government bonuses

This is genious. But I think opposite types, such as ecologists+industrialists, and religious+scientists, should face penalties, not bonusses. Such a system is inherently unstable, with them following contradictory goals. This makes the elections more challenging, something I think the game needs. 

Do you think your idea should be implemented with one dominant party and one weaker one? Or if no party has a majority? For instance, will coalitions apply with a 60% industrialists and 40% ecologist (in theory this is not a coalition), or if both industrialist and ecologist have less than 50%? Although less realistic, I think the former option should be chosen. Otherwise it becomes too complicated with minority coalitions and stuff.