You can use cheat engine for almost everything, check akt/def/... valute for any unit and after upgrade search for it again and change it (don't foget to check to froze that valute) and any new fleet/ground force will be stronger, alredy exisiting will slowly upgrade to new valute.If you're playing as an officer its easy to find coz its stucks more then 1. For leader its true/false action I think and I have troubles finding it.
Btw does anybody knows some cheat-mods, mostly on science front? I myself cant find any of them.
Just save and load when valute change - it will not change adresses of valute, closing and starting game will change them.
Or if you want only yors fleet (not other faction/ruler control) get stronger so improve your ship in quest - again search for valute (best after just star the game just need to search fo 10 18 240 and exp - 0)
SAVE > go for mission and get exp > search for exp again > LOAD > ... repeat it to level up and change your ship stats, change stats (witchou construction - too high will break game) to 9999 and freze them including ship level and hp. Then use your ship to upgrade your fleets.