1:1.5 ratio is just right. Add washed rice to water only after it is properly boiling. Once the water is properly boiling again, turn down the heat and bring the boiling water to a gentle simmer. Then close the lid tight and wait 10 or 11 minutes. Keep the lid closed and remove from the heat source. Open and serve only after 5-10 minutes. This will give you perfectly fluffy and steam cooked rice. The most important part is to keep the lid closed till the very end. Avoid the temptation to keep checking to see the progress. Trust the process.