If you've found that the larger blades work better, I'd use that as a starting point in trying to figure out how to get the smaller ones to work. I'd look at the ratio of blade length to bait length, distance from back end of blade to lure body, wire diameter, rear treble size, basically every variable, and change them one at a time until I got something that worked. Fortunately you can salvage and reuse just about everything except the wire, so do some experimenting in the bathtub, but not while you're in it. Hahaha