But I thought the purpose behind the sparge in this setup is to get additional volume beyond what a full volume allows from a capacity perspective. Granted, I am only hoping to get 6.5g-7g tops as I ferment/serve from a 6g Torpedo, so maybe I won't be limited by this.The efficiency difference would be negligible, if at all. Pouring over the top would be like a lazy fly sparge assuming you added it immediately after lifting the basket. I personally don't think the few percentage points you gain by sparging is worth having to heat up separate water and would rather add the extra 5% grain to just do a full volume no sparge. That is the added simplification that most enjoy about single vessel brewing.