Just about any streamer that you'd use for trout will catch bass if it represents minnows found in that water, Most of the "traditional" feather wing streamers, flatwings and buck tails of the 30s-'70s were designed to be easy to cast. (those guys didn't have high speed carbon rods and super lines to work with)
Lefty's Deceiver was designed especially to get a very large fly that was easy to cast, I believe.
Anything that adds bulk and pushes water will also have more air resistance, compromise
I'd personally not use lead eyes or cone heads with a light line.
My go to flies on bass streams Tap's Bug, Gartside's Gurgler, Zonker, Woolly Bugger typically on #2-#4 hooks, for smallmouth <4#- with the exception the Zonker, I can fish these with a #5 line and a short stiff leader, although I normally use a #7. Streamers I tie to be 3"-5", and usually fish at the surface- I think I can disturb more water at the surface than I can deep.
Experiment with your line and leaders to see what works for you, my 'standard' bass leader is about 3' of 20# butt and 2' of 8# tippet. If I want longer, I'd add to the butt and maybe use 25#.
If you are floating so that the casts can be kept short, you might consider a heavy line for larger flies, I would.