Revolution and Advantage are safe for bunnies, as you said. You may want to ask your vet about which is more effective in your area, as they will prob have a good idea about how resistant the insects are. They might recommend switching between the two each month. I think Advantage only works for fleas, but Revolution works for fleas, ticks, mites, and some other things (don’t quote me on that though).
Frontline is very dangerous for bunnies, so I wouldn’t even use it on the dogs.
I was going to suggest diatomaceous earth for using around your home. It only works when it’s really dry, so I’m guessing the humidity might have made it less effective? It doesn’t really work outside, but you can sprinkle it around your bun’s area inside.
I would stop trying cedar and oil based things, as some can be harmful to bunnies (although it sounds like they didn’t work anyway!).
.
.
.
The answers provided in this discussion are for general guideline purposes only. The information is not intended to diagnose or treat your pet. Seek the advice of your veterinarian or a qualified behaviorist.