Did you modify the shipcomponentdefs.xml directly or did you make a copy in your mods folder and modify that.

Tooltip descriptions that say 'Increases rate of fire of Beam Weapons 30% but lowers damage 15%' are hardcoded into the text descriptions, so you will have to edit these to reflect any changes you have made.

The stats below the description in the tooltip, are dynamic, and should change based on what stats are in the xml 

Hope this helps.

Which stats are you trying to modify?

I have just done a quick test.

Copied shipcomponentsdefs.xml to mod folder '....\Documents\My Games\GC3Crusade\Mods\ExampleMod\Game

Fired up the tech tree editor, set the mod path to point at '...\Documents\My Games\GC3Crusade\Mods\ExampleMod

Select View from drop down menu, unselect 'default tech trees only' this will load the mod file instead of default file.

Double clicked on 'Prototype Duranthium Driver' icon  (pulse cannon tech) this opens up the relevant xml file (small bug - says its a core file, ignore)

Edited the Duranthium cost from 12 to 2 and edited the Kinetic attack to 40, saved and loaded game.

Changes are in working in game. Tool tips show new values etc.

If it still doesn't work ,remove all mods from crusade mods folder and base game mod folder.

Glad you got it working.