Regarding the online merchant I mentioned not carrying Li Zhi He (Lychee Seed), I spoke to my herbology teacher tonight and he said that not including that herb in the formula is no problem at all as a)it isn't an important member of the formula anyway and b)another herb in the formula already, Ju He, has very similar properties anyway.
So, no problem if you don't include Li Zhi He. Should get a great result anyway.
Regards,
Mike