> Which as far as I can tell isn't terrible if you don't breath it in and if you do the official allowed exposure time is 10 minutes for 5 ppm.

Presumably that's 5ppm under terrestrial conditions, Venus at 40km has substantially higher pressure, more than is explained by the higher temperature alone, so any given ppm is a greater number of molecules per cm³, right?

7 ppm of atomized H2SO4 will definitely sting a bit. That's roughly 7 g/m^3, TLV for sulfuric acid mist is 1 mg/m^3. Survivable but you would want to minimize time in it.