Welcom.... Im new to but got one question for you:

Are you sure it was named "San Peruvian" cause i have never heard nor experienced that cacti before?

If you meant San Pedro that would make more sense to me and if you want I can get you a nice recipe for proper dosage and extraction to make paste! nasty tasting stuff indeed but done properly and mixed with the right amount of water it goese down smoother and your psycadelic experience will last around 20-24 hours