SPJ, you are the one lumping Boomers in with the rest of the "rear fanged" snakes. To me they are not quite that easy to put into one group or the other. They do not have traditional fangs (hollow) but you are correct they are very big and as you said not all that far back.
To me Boomers are an anomaly. They don't have hollow fangs but they are quite large and unlike most colubrids their "rear fangs" if we must call them that are folding due to their size the way vipers are.
They inject very large amounts of venom and are highly toxic to humans. To me they just don't get included in the general world of rear fanged colubrids at least in the hobbiest world.
Perhaps when I said, "Well SPJ that is true" you did not realize I was agreeing with you that indeed Boomers are not something you can just handle by wearing gloves.