cloak,
the first step is to make a set of reference files for the version of sins/entrenchment that you have by copying you sins/entrenchment folder to another path then downloading one of the convertdata gui's like dekanrics or mine,
2 converting the copy to txt mode (btw the convertdata_original sins.exe fails to convert 3 tech capital ships in 1.16/1.17 but the only significant differences between 1.15 & 1.17 are numbers, so you could use the forge tools version),
3 open the CAPITALSHIP_racetype.entity files, & find the ability name(s) that you want to alter,
4 then copy these to the mod's folder and
5make the changes to them and
6 test the mod in entrenchment
harpo