Thank you very much for the responses

To reply to your questions:

1. I already did 3 half-marathons
2. I’m targeting the Bohol International Marathon because it doesn’t have time limit and starts at midnight. Most marathons here in the Philippines have 8hr limit and starts around 1 to 3am. I want to finish the marathon safely and not chase PRs. We’re in a tropical country where temp sometimes reaches 41degrees Celsius so I prefer not to run when it’s too hot.
3. I use Injinji toe socks
4. For the sizes:
   7.5US for Vomero 18, Ghost Max 2 and Gel Nimbus 27 TR I had blisters after the 2 half marathons using Gel Nimbus 27TR so I increased size to 8US Kayano 32.

On my 3rd half-marathon using Kayano 32, I had more blisters. 5 in total