Ok so looking at it again after how much water you said you were giving, dont measure it in cups or whatever, give them plenty of water thouroughly throughout the soil (that parts important) until you get water coming out the drainage hole at the bottom and no soil is left looking dry. Now once the water stops running out the bottom (a tray or something under the pot helps), lift it up and feel how heavy it is. That'll give you a rough idea of what it weighs when its "watered" (Common sense applys here obviously, the plant will get heavier over time). Now just leave the plant and dont water until the pot feels (relatively speaking) light again. When it does thouroughly apply water as above and you'll be rock and roll.
EDIT: It'd also help if you opened up any soil you want to use with some perlite, you can usually buy a large enough bag of it in any garden center/DIY store and make your soil around 15-20 perlite. Lets your roots breathe.