So you don't get 17 days off. You get your 10 plus you are on reserve right? So they don't use you those 7 other days. Those aren't days off.
BTW i would love to fly a 330 but i wouldn't fly it for what i am making now. What you have to understand is that Airline Management are preditors. They look for your weakness and jump on it.
You like your job so much that you will do it for poverty pay. Managment knows this and take advantage of it. But it doesn't have to be this way. You can like your job, be good at it and get paid well for it.
It can be a win-win for your passengers you and management. But managements greed is taking away your comfortable retirement. If i was you i would be very very upset with that.