Hair Bleaching Question (Kinda long)?

So I have bleached my hair before, and it came out great, no problems, I loved it. I am planning to do so again this summer. My question is, which way of bleaching would be better.

1. Last time I used 40 volume developer and bleach powder, only had to bleach once, and got from a medium-dark brown to a yellowy blonde. Followed by a protein treatment and olive oil treatment.

2. I am thinking about this time doing it over the course of three days. First, I will saturate my hair in coconut oil, then bleach with 20 vol developer and powder for about 30-45 minutes (this will be less of a change, but also less damage). Then do an over night olive oil treatment. Then the next day, I plan to saturate my hair with coconut oil again, and use 30 vol developer and powder. Let it sit for 30 minutes or till desired color, do a protein treatment/reconstructer, and another over night olive oil, followed by toning the next day. Would it be best to do the second, or the first? I'm looking for a good look, but with less damage. I'm assuming 2 is best, but I just want to be sure that all of these treatments won't hurt my hair as well.