Not OP but white rice in instant pot is 1:1 rice to water.

For brown rice i use a bit more water. Maybe 1:1.25 rice to water.

Are you measuring volume or weight?

That doesn't sound like anywhere near enough water to me. I do roughly 1 cup of jasmine rice to 1.5 cups of water in my instant pot, comes out perfect every time.

Volume and I often do jasmine rice as well.

1 cup of water, 1 cup of rice and cooked on the rice setting.

1:1 volumetrically is about the ratio I use as well with great success

1:1.5 sounds like a very mushy rice. Horses for courses I suppose.

Mushy rice is best rice.

Plus if you can hydrate while you eat, it's more efficient!