Blades, way back in the 80’s there was a video called Jon fix’s how when and where, I’ve watched that 1000’s of times ton of good fishing info, though it’s bass centered it’s apples to slit of species but in that video he talks about taking a colorado blade and using needle noise pliers to curl forward the very bottom edge, said it made a big difference in vibration, also you can off center the attachment eye, holes actually reduce and hurt vibrations which are felt through there lateral line

Personally I’ve studied these fish alot, I believe there like sharks and can pick up in the electrical pulse, that’s why they just nose the purdiest of jigs when there not aggressive but suck in a lively minnow, if a man could creat a small battery powered jig to give off electrical impulse or have a wind up powered jig (the blade being the working turbine) I think he would really be on to something, it will be created at some point and folks you heard it here first