Just got back from a trip so not seen this before can sympathis spent 3 weeks looking at UTouch ended up rewriting a revised system
Also rewrote the calibration but that still a little off on 3,2 screens had to use big font or bigger than 16 x 16 icons.
If you send me an email address quite happy to let you have the code. its pure C++ not as a so called library for Arduino IDE I use the Xcode / Embeded X option but if you are a capable programmer you should be able to modify.
Don't want to publish it as an Arduino Li=brary not got time to support it at present hence my comment on an email address to send you source..
cheers.