Ok, I like the nerf that the HTGR reactors just went through! Previously I could run 1 turbine on 4 HTGR cores and a single heat exchanger. That was kind of overpowered given this is supposed to be the tiny safe reactor, the smaller cousin to the fission unit.
Now to run the same turbine, I require 12 HTGR cores arranged around a single heat exchanger. They run cooler, and require more of them to give off enough heat. This arrangement just barely makes the turbine stay at full speed, with a turbine flywheel.
Nice.