No chart for HFT Butt hooks that I know of...........you just need to read the UKAHFT rules and interpret them the best that you can. Dont forget, just to make it even more interesting, not all regions have the same rules regarding butt hooks and HFT ,and do not always follow the UKAHFT rules. If you want the official UKAHFT and you are still not clear you need to speak to Pete Dutton as has already been mentioned.
Personally I think that you will struggle to set up any gun properly to shoot both FT and HFT with.
Not quite sure why you are disappointed that there are two disciplines though.
Got to be a good thing as it has brought a lot of shooters into FT and HFT, and a lot shoot both.