Go to: ...\Microsoft Games\Freelancer 4.86\EXE\flhook_plugins
Look for: techcompat.cfg
Open it with notepad and figure out which of the values are wrong.
Most of them are pretty straight forward if you get to know them a little after reading through it.
or...
If you don't like the whole nerf system, change all the values to make them all give 100%
Explanation in the file on how it works.
And since I'm bored, I'll add...
1.0 = 100%
0.9 = 90%
0.75 = 75% etc...