I used to sell shrooms and I would suggest 3.5 to everyone
The 3 strains i sold were Puerto Rican (gold caps), Amazonian, and treasure coast.
when i do em all my friends eat an eighth as well but i eat 5 grams. if you've done em before id say take at least an eighth, but 2.5 i think u will feel it in the body and not as much in the mind.