I would guess it's just going to take a little practice (hate to say it). You're going to have to find the proverbial "sweet spot". It seems you have to press unusually hard to scroll. This is usually the biggest complaint with Coby tablets if you read some of the reviews.
When in the applications, try scrolling at areas not near the main options (the side of the app for example). You'll have to find the proverbial "sweet spot"
Some devices have a screen sensitivity adjustment in the device settings, but I haven't found anything concerning your device. I have however, seen references to using the supplied "stylus" if you have a lot of difficulties. Seems stupid to buy a touchscreen device where you have to use a stylus, not to mention you're always losing the darn things.
Also, did you apply some type of "screen protector"? This will only make the sensitivity problem worse.
You can try this place, as it seems they have a lot of support for Coby Tablets;
http://www.androidtablets.net/forum/coby-tablets/
As a sidenote, I believe your tablet may be able to be rooted, and perhaps installation of a custom Rom is available. Or at least be able to install some firmware patches. Sometimes, Rom developers add a screen sensitivity option. Just someting to think about for the future, when you've had enough of the sensitivity issue
