I work 0.6 and I definitely don't work as many hours as you. You need to say no to any extra responsibilities first off unless you're getting paid specifically for them.
I borrow and recycle resources as much as possible, I do generally work at break and lunch but try to make sure it's only photocopying, filing or quick marking so I don't feel stressed.
When I set ks3 hw I try to make sure it's relevant but v quick to mark eg quiz/test/poster/factfile/research diagram/sketch or limited to a paragraph or 2. With ks4 we have some pretty robust time saving assessment policies after we all got sick of it! I only have 1 ks4 class this year which has made a huge difference as well!
I try not to be too technical when planning lessons and I do tend to plan on a week by week basis rather than really far ahead. It sounds like it would be worse but if I plan really far ahead I start trying to add more and more complicated ideas which take more time. Don't get me wrong I still plan a good lesson but good lessons don't always need complicated planning.
It helps that I have a really supportive department and if I need something I know they've already done they just hand it over.
I have 2 days off a week and I don't work during those days at all UNLESS I have mock exams or end of unit tests to mark as they obviously take time.
I work 3 days mon, tues, fri always leave by 4.30 for childcare reasons. I work maybe 1hr mon night. I don't work tues night. I don't work at all weds and thurs daytime. I might do 1hr on Thursday evening if I need to. I don't work fri evening. I do between 2 and 4 hrs at the weekend. I get to school at 8.10am and the day starts at 8.45.
I have had to accept I'll never set the world alight as a teacher or have amazing career progression doing this but it has sorted out my work life balance and I'm happy at work now. I'm still a good teacher, I get great results 