If it takes you 60hrs/week to do 39hrs/week, you're not going to be able to fit 2*30hrs/week into 60hrs/week.
The extra hours I do are more for my sense of perfectionism than to do with keeping up. I fill the extra time because I want to. I just now want to start getting laid for it.
Then why the heck do you do them?
Instead of thinking of yourself as a perfectionist, start thinking of yourself as an insecure person. You’re insecure about the quality of your work so you pretend that if you spend more time on them your insecurity will go away because then they’ll be done perfectly.
Make a list of 10 or 20 things you’ve done perfectly recently. It shouldn’t be hard since you’re a perfectionist, right?