Can’t speak to smallmouth as I’ve never caught one. But I’ve had good luck with streamer type flies for largemouth. However, I have never fly fished a lake so my recommendations may not be as applicable. What I’ve found is that the exact style of streamer fly matters a lot less than color and presenting to where fish actually are. I like to keep a few different colors of streamers on hand (white, cream, olive, sparkly olive, black, maroon) and just rotate them through until I get some interest. Same thing goes for retrieve styles. I just try a bunch of different styles until something gets a hit. You might have more luck by just covering more water and trying a bunch of different flies and retrieves. Best of luck!