Of course you will do more, you work 20 hours less then him and thus spend more time at home, that's expected from you.
So what will your response be when he asks for financial contributions from you? at least a 1/3 towards the bill while he covers the other 2/3 since you also work ? will you accept or refuse?
If you refuse why? and if you accept I would like to know why you refuse to take the initiative in the first place?
If your response is because that's his religious obligation, well he is also the head of the household and he could command you to stop working since xoolahada walagu qasaarey, will you obey him in this?