It's definitely true that these mods, especially atomic science, need a little more balancing when used alongside other mods.
But from a practical standpoint, why would you use a railcraft boiler to power turbines? While it does seem very effective, an atomic science nuclear fusion reactor produces a near infinite amount of power when harnessed properly using steam funnels and liquiducts. I got up to 153 large turbines in a creative test world before I gave up trying to find a limit. In terms of mj, thats more than 22,000 mj/t, and it filled an ultimate energy cube in less than 3 seconds.
On a related note, that many turbines will murder your fps. As soon as I got near to that setup, my fps dived down to 15ish. Even in my survival world, where I have only 32, my fps hovers around the 40-50 range, when it's normally in the 70-80 range.