I personally think the default is fine, it just needs a config option for people who use big reactors.Check this thread:
http://www.minecraftforum.net/forum...ys-rftools-endergenic-generators-and-their#c3
A few people are generating a relatively decent amount of power.
Also make sure to infuse the generators as that makes them more efficient.
But yes, I can consider increasing the benefits as it is rather hard to get decent results. How much better should it be by default?