We're on opposite sides of the country but I'll let you know what has worked for me. The lake I fish I recently measured some small minnows around 4". I've been throwing the bigger Keitech swing impact fat 4.8-5.8" without bites. However, when I switch to the 3.8" and the 4" swing impact/easy shiner, the bass choke it. I've caught all my 3lb+ bass on these smaller swimbaits.
Moral of the story, I try to match the length, girth, and color of the small baitfish as best I can and it seems to have given me the best results.