All leaves you listed will work and from my experience damiana were the least harsh of the leaves. My friend that makes his own blend uses .5g of jwh per ounce of substrate for a mild batch and 1g jwh per ounce of substrate for a strong batch. He mixes the jwh with gran alcohol, everclear, and then mixes it into the leaves and let's the alcohol evaporate. And we are not supposed to share sources here.
Also a ton of sites are sold out of the leaves that you listed.
It is important to remember that the majority of these ingredients are just to make the smoking experience smoother. The next step in our process is obtaining the chemical responsible for “getting you high”. Almost every company uses JWH-018, a popular and widely available synthetic cannabinoid. We recommend JWH018Supplier for a quick and safe online transaction.
Thanks and Regards,