I'm having leafhopper problems too, been spraying with neem and it reduced the population but hasn't wiped them out, and it's getting too late in flower to continue spraying, so I am right there with you in this predicament. I think ladybugs are too small to eat the adults, tho they may go after the larvae. I have a couple praying mantises, and they eat a buncha bugs, but they really just reduce the numbers they don't wipe out the population the way I would like. If you find a solution that works, please do pass it on haha.