I have caught bass and yellows on Vivif and Hoochy Toads. The vivif tended to have a stiff tail - so to give them better action, the tails were shaved - looks like your grandfather used them and thought the same thing. Talk to Matt Salas about the O.Pop jigs.
"The world of Truline is a mystery and a trap" is the best way I've ever heard it put.
Heads-up: Fred Hall has the potential to be a Truline armegedon this year.
I'm getting there early to get a good seat for the shit show.
Provided it occurs.