Miss Lydia,
as for your problems with the dust in the coops, just how much are you using?
As for the Sevin Dust, it only takes a tiny bit. I get it in the shaker bottles and just very lightly dust the coops, there shouldnt be a dust issue in there, if so, you are just using too much (which never hurts) but lighten up on it a bit, and you wont have that problem (at least with Sevin) the others, I dont know, I stick with what I know works and works quick, I hate the little buggers and dont want them on any of my birds....
I have about 600 bantams here, so all that other stuff is just out of my price range to even consider. I'd have a grand in Frontline, LOL
Only takes 4 cans of Sevin though at $5 per can to treat all the birds, 40 breeder pens, and houses and the grow out pens wont find any thing cheaper or more effective than that, and yes it's 100% safe. I would think Frontline would be more risky as it's not intended for poultry use to my knowledge (most likely why those vets wouldnt give a withdrawal time on it) I actually killed a cat once with it, it licked the spot, and within an hour its was having convulsions, foaming at the mouth and died, so forgive me if I dont take anyones word for it on it for chickens, LOL.