Have you considered two smaller tanks instead of one big one?
I installed 2x 55 gallon tanks from west marine for $430 each:
https://bit.ly/3ue8Z6x
- downside is that I had to build and glass in a cradle because the tanks were a little too tall for the existing ply tank slot, even after raising the decks and removing the in-deck fish box.
- upside should be that I can adjust center of gravity a bit by figuring out which tank to fill/use.
- additional upside was price and not having to pay shipping (e.g. ship to local west marine for pick up)... parsimonious yankee.
- No idea about the baffles, still haven't gotten the boat wet yet. Will report back later.
To completely illuminate the gas smell, you can install the new EPA-certified tanks and charcoal filter systems, but that gets expensive. Toyota covered the $1000 repair to the charcoal filter in my landcruiser, caused be me 'topping off the tank,' so I am not convinced the technology has quite been figured out yet. For older boats, you are not required to replace with the new EPA-system.