DO NOT BOIL. It does nothing good. All you need to do is shake in water and drink the rinse. All you are trying to accomplish with poppy seed tea is to rinse the pod residue off of the seeds. They were likely not "sprayed" with morphine. The residue on the seeds comes from the pods they were in, that is the good stuff. That residue is what contains the morphine I believe. Someone can correct me if I am wrong. If the tea is dark and murky/muddy and bitter, this usually means they are pretty potent, at least in my experience. But again, DO NOT BOIL. Just rinse!!! Trust me on this.
I am pretty sure you are right in that it is just a conversion regarding the mg / tsp thing. For me, with potent ass seeds, I use about a pound or less for an all day high/nod. BUT that is with a gram a day IV H habit so I am not recommending anyone start with that amount. Note these are good...no GREAT seeds from a trusted source. If you get washed or semi-washed seeds from some local bulk bin at a grocery store, who know how much you will need.....PST is very very hard to dose correctly and batches vary in potency depending on source and can still vary from batch to batch from same source.
If you think your seeds are potent, which it sounds like they might be, maybe just use a pound of seeds and drink HALF of your rinse SLOWLY and see how you feel in an hour or two. Then drink more if you are not were you wan to be. For me it can take up to two hours for the full effect to kick in. Please do not drink some and then drink a bunch more a half our later because you think it's not working. This is a quick way to OD or at least have a very bad night....Hope I answered some of you questions. Happy Sipping