Android :: Touch Sensitivity With HTC Dream 1 Device Lacking

I am the developer of WordUp! This game makes heavy use of the View touch apis to detect press and drag gestures across the letter cubes. Once in a while, I'll get a complaint (unfortunately coupled with a lower star rating) related to not being able to press and drag very easily. For example: "Would be fantastic if touch sensitivity wasn't so off-I had to practically dig my finger into the screen and drag it to connect letters." As a developer, this is really frustrating as I think this is an issue with the HTC Dream 1 hardware and possibly the Android 1.1 OS. I don't think it's fair that I would get dinged for a problem which rightly falls into the court of HTC/Google. In my experience with my own dev phone, I have found that a certain amount of natural oil on your fingertip makes a big difference in how easy it is to press and drag. I know that the touch screen is based on electrical current and, as such, it makes sense that the more oil on your finger, the better "connection" your finger will make with the screen. Perhaps the aforementioned user windexes the screen on a regular basis or compulsively hand-washes? In any case, I am requesting some reasonable explanation for this as I know it's not an isolated incident.