Hello, I am new to the forum and just created this account to point out an easy fix for a problem that I haven't found anywhere else.
After installing Real Scale Boosters and Real Fuels through CKAN for 1.2.2 I realized some second stage boosters like Delta II-K were incorectly treated by the game, not using the liquid fuel values but instead only the RCS volumes as they were catalogued as "service modules", and therefore having a small fraction of their overall thrust capability. I fixed this problem by going to the Real Scale Boosters folder, then Parts and into every booster folder changing each second stage "tank" text file; you will need to delete every resource line below the main information but electricity, monopropellant, liquid fuel and oxidizer. Then Real Fuels will treat the part in a correct way.
Greetings.