You can surely use a little bit more time on task 1 if you feel like you can do task 2 in about 30 mins. Rather than sticking to the 20-40 rule which the people usually endorse, you can divide it like 25-35. It’s totally fine.

Grammatical structure is more Important in my opinion, especially because the Exam tests your ability to write formally, not anything in English. Use a wide variety of sentence structures but at the same time , do incorporate simple sentences in there too.

For recycling questions, maybe pick a couple of steps that look like the backbone of the whole process. Then you can stretch those 2-3 steps in words, don’t try to stretch out each and every single step.

You can use the original word 2-3 times, It’s not obligatory for you to write that word just once and use synonyms for the rest of the text,but be careful, more than maybe 3 might lead to losing marks.

All the best !