How do you feel about terminal spray post torque on these 280ah batts?
Corrosion inhibitor between the terminal and the bus bar/lug, yes. After install, if the bus bars corrode on any surface other than where they mate with the terminal, I couldn't care less. At that point, it's just aesthetics, not functionality.
If you're using aluminum bus bars against an aluminum terminal, the likelihood of corrosion, due to dissimilar metals, is almost zero. However, if the mating surface is not airtight (highly unlikely that it is airtight), a thin layer of noalox or no-ox-id is appropriate.