Why don't you simply play it in PAL mode? Amiga can switch to both PAL and NTSC, however if you try to run it on your NTSC TV, then I understand your pain as it cannot sync to the appropriate refresh rate amd understand the colour sygnal. :-)
If you have ab Amiga monitor (e.g. 1084), simply run it in PAL mode through WHDLoad (make sure the PAL tooltype is present in the game icon), and you're all set. Amiga monitors are 100% PAL and NTSC friendly, in any territory, as they use RGB which is more colour/sygnal tolerant than composite or s-vhs.
