Usually when we're talking about unders and overs, we're talking about under and over the slot. I don't know exact weights, but I've heard of some 3 pound unders (16 inches or less) and the 5 pound over you mentioned. I've never caught a DD in the slot (under the 24" mark, but I've been told about several. I caught a 9.23 that was 22.5" this past winter. I think she has a chance of making DD before she gets out of the slot.