I’ve done okay on river smallmouth with the 3” mold I have. To be honest though I have not fished it hard. I can’t seem to give up fishing my comfort baits the small profile 3” twin tail, 3/3.5” chub grub, or the 3.5” Do-It tube. If those aren’t producing I throw a square bill shallow diver. If all that fails to connect I start beating the water with big musky plugs. I really need to make a few trips dedicated to this bait though.