I had the same issue with writing I am so slow and usually I don't finish. My first attempt was Academic IELTS and writing was 5.5 then my second was General IELTS and writing was 6 or 6.5. What I did in my third attempt is that I started with task #2 first because it is longer and has 2/3 of the final mark of the writing section. that helped a lot and I got 7 and my score jumped from 368 to 431. just change your technique and good luck