Yep, I wouldnt worry too too much. Most new growers over water, not under water. I do the same thing... stick my finger down an inch or two and if its moist, I leave the plants alone. Once its completely dry down there I will water. Apparently it also makes plants stronger if you wait longer to water them, as they arent being babied all the time. I also read in an Ed Rosenthal book that plants can survive wilted for sometimes up to three days. So have no fear, just keep doing what you are doing. And as someone else said make sure you test the Ph before you water them...