Chameleon in C64 mode outputs a totally async picture at the moment. To reduce tearing effects, the framebuffer uses double-buffering. However, perfect scrolling can only be achieved if the TFT supports VSync display, or if a CRT is used.
The Amiga mode is based on Minimig. It has a sync output, so scrolling is perfect. Again, a flat screen must support VSync mode, which is usually a gamer's feature. Look for a monitor like that, and you'll have as smooth scrolling as you are used to from CRT screens.