don't worry what kind of deal you got now, its too late. just buy from someone you trust in the future.
with shrooms weight doesn't really determine potency. freshness of the shrooms and the age and condition of the mycelium from which the shrooms came play huge factors in how potent the shrooms can be. the very first small mushrooms(primordia) a myceluim produces are the most potent and can be very intense when fresh
for ingestion i suggest making a tea out of the whole batch and split it equally so in theory you both get the same dosage. steeping the shrooms in a tea breaks down the very strong cell walls of the mushrooms so your body doesn't have to. not to mention you can add all the honey you want to take away the nasty flavor.