as a rough guide the water should be roughly half inch above the rice,try cooking your rice by absorption,cook your rice the way you are,once the water boils,after 1 or 2 minutes,cover the pan with bacofoil and replace the lid to get a tight seal,switch of the gas and leave, check again after 20 minutes,if not cooked just replace lid until you are happy with the end result.fork over rice and it should be nice and fluffy.
hope this helps Terry