I think perhaps we are talking past each other as you suggest. I would still like to try understanding the heart of the problem you're seeing. Would it be fair to say you didn't understand how 2 versions of the "same" aircraft can be so different in weight? I do believe that the weights in the game are a little heavy for the E and a little light for the C, but not by much.
Consider the following: compared to the C model, the E has:
-Stronger/heavier structure to carry heavier weapon loads, mounting points for the LANTIRN pods, as well as increasing the airframe life from 8,000 in the C to 16,000 in the E. I think I remember hearing this amounts to some 1,500 to 2,000 lbs.
-Second crew member and added avionics accounts for several hundred pounds.
- The 229 engines are about 600 lbs each heavier than the 220 so roughly 1,200 lbs total.
-The CFTs are somewhere around 4,400 lbs for the pair.
Add all these up and you will see there is an increase of somewhere around 8,000 pounds. Add in the LANTIRN pods and you will end up around 9,000 pounds or 4,100 kg heavier than the C. If the numbers are off, they are not off by much.
Hope this helps.