while i remember, would it be possible to fix the problem with the saves myself or is really complex coding
Never looked in to this problem, so I can't tell you anything...
Nope, the IDF was nerfed in the video AND the mod. WAY too powerful for even the Hierarchy ships.
IDF's weapon was nerfed. IDF and Hierarchy is very different races and each one of them use different tactics of fighting. For example: IDF prefers precision strikes from long range, Hierarchy steamrolls their enemies. If IDF ship will get too close to Hierarchy's ship, it will be wrecked in to pieces in seconds, but if it will keep range, eventually IDF ship will destroy Hierarchy's ship.