You're fine, that's a totally reasonable question.
The answer is that 1084 is not in fact the most recent version, it's just the last version which was assigned a version number on the mod's main download page. The latest (currently) is 2.0.14.1094. The changelog
http://ci.micdoodle8.com/job/Galacticraft/changes shows that the Buildcraft energy ratio was modified in version 1087, and because the Thermal Expansion is calculated from the Buildcraft ratio, that has also now been updated.
We had a lot of trouble finding the correct ratios in 1.6.4 because Galacticraft's energy system was closely based on Universal Electricity (once upon a time back in Minecraft 1.4.7 days, Galacticraft was one of the Universal Electricity mods as the idea of a single energy system across several mods seemed like a great idea at the time). Unfortunately, that meant we did not start off with sensible conversion ratios but it took us quite a bit of player feedback to realise that.
Galacticraft 3 has a redesigned energy system with ratios which should be more consistent and realistic from the start, or if there are problems then with any luck they will emerge in the BETA period.