This is the only mod I have seen that changes Tech Values, BUT, I do not think it has been updated for 1.7.
The other alternative is making a copy of GalCiv3GlobalDefs.xml from the installation directory and placing it in My Documents/GalCiv3/Example Mod/Game and editing the lines related to tech increases:-
<!--Each time you research a tech in any tree the cost of all techs are raised by this exponent-->
<TechInflationExponent_All>1.25</TechInflationExponent_All> (25%)
<!--Each time you research a tech in any tree all techs cost is increesed by this multipyer.-->
<TechInflationMultiplier_All>0.1</TechInflationMultiplier_All> (10%)
<!--These values allow us to further inflate techs on a per tree basis, this is to discourage the
player from drilling down a single branch of the tree to quickly, and over specializing.
I have removed the exponent, and have only a small multiplier, since it is added to the overall inflation settings.-->
<TechInflationExponent_Tree>1.0</TechInflationExponent_Tree> (0%)
<TechInflationMultiplier_Tree>0.1</TechInflationMultiplier_Tree> (10%)
Increase the values in red, I would do it in small incremants myself untill you get the balance you want. Otherwise its a case of editing every TechTree from every faction to increase the Cost values, alot of work.
