Frenchie is my favorite nymph that is not a scud. . . Scuds tied in various color threads and dubbing can bea game changer. I have had days where a tan scuds just gets it done and it seems like your the only one catching... then days where the tan isn't working and the are hammering gray with a red head. Same on frenchie red hot spot vs orange... I think it's more important in high pressure water to vary it just a bit from the normal shop flies. The buggies the better on free stones and wild creeks but parks and tailwaters you have to get creative.