I've had poor success with a green Tasman on Cachuma - its trout seem to prefer red, orange, or silver. 2-3" spoons do very well pulled at walking speed; and as many catches are in shallow water where there's drowned twigs and branches, I pull with 15lb or better fireline. Line visibility isn't a factor with a reaction bait at trolling speed; and having your lure pull free as the hook straightens is better than losing it.
..Interestingly, I've found that pulling a bass crankbait, the big ones that run at 20+, catch nice trout when pulled at a slightly faster speed than bass like. Probably bcs bass are primarily lurkers and trout are cruisers? Whatever, when my first catch with a crank is trout, I've found that slowing down starts bringing bass aboard.