My hair is quite fine and always in need of a volume boost. I've tried Dust It and it's quite good although I'm not hugely fond of the tacky feeling. Mousse is ok but I'm just sure there's something out there I'm yet to discover that will give me humongous hair.
I have a Babyliss Big Hair styler it's nice but gives me blowdryed hair rather than actual big hair.
I'm the same as you. I use Batisse XXL volume dry shampoo. Makes yr hair feel like loft insulation but does amp it up massively. I also put a strip of extensions in on a rare night night out. I've got the big hair gadget too and it doesn't give me big hair either, just a sleek blow dry.