For a psilocin A/B extraction, in the B stage adjust the pH to 8.5-9.5, and no higher, and very quickly extract with DCM or chloroform.
Don’t leave it in freebase form. As soon as your DCM or chloroform is all evaporated, add tartaric acid and a little water to form psilocin tartrate and let it slowly evaporate. Tartrates are very stable and quickly digested. LSD is usually made into LSD tartrate for that very same reason. Freebase LSD is extremely unstable.
Once you have psilocin tartrate, you store it like that in the refrigerator in the dark in an airtight container. It should last quite a while that way.
Then if you want to freebase it, do that on the day you plan to smoke it.