Hello,
The steam turbine (regular one) seems to be adjusted to 415 Degrees for simplicity with numbers, great balance change from original Krastorio 2 IMO.

However, on Vulcanus, it looks like the Acid Neutralization recipe still produces 500 Degree Steam. This effectively nerfs the efficiency of the turbines there. But I could understand if it was intentionally left due to it messing up the ratios of the recipe in order to make it 415 degrees.

It can still be efficiently harvested by Advanced turbines (at sacrifice of size), but besides that, I think the energy calculations of heat of steam realistically comes from the calcite. So, at risk of overcomplicating the recipe, you could probably change it to

1 calcite + ~ 1200 Sulfuric Acid = ~12000 Steam (415).

The true math would obviously be derived from the difference in joules per steam unit and what not but, it looks like about 20%.
and maybe slow down the recipe accordingly?

I'm not sure, hope this helps though.

There is one factor you didn't take account. Krastorio buffs steam heat capacity from 0.2kj to 0.5 kj this means each unit of steam holds 2.5 more power, so acid neutralization should release about ~5000 415C units of steam, to generate about the same amount of power as vanilla.

Thank you