I'd like to suggest fixing condensators to work in fluid reactors, and find a way for MOX fluid reactors to output more heat. I have suggestions after my reasoning on why they need to be fixed, which is mainly "complexity should bring reward".
Fluid reactors are limited by the amount of heat they can transfer, due to the space and component limitations inherent in the fluid reactor itself. Practically, this is about 1370 HU/t. That translates to 1027 EU/t.
Fluid reactors are completely dependent on heat output to generate power. EU reactors are not.
My assumption for UC2 is "complexity brings reward".
MOX EU reactors work differently than fluid MOX reactors; the result being they are not dependant on heat and don't dramatically increase heat output the way fluid MOX does. This allows for EU MOX reactors that can put out more power than a fluid reactor, and still be simpler. This is the first issue I'd like to suggest fixing.
Condensators remove massive amount