i'll give you a tips, xp you see in barracks is not your real xp, that explain why when you change your xp on cheat engine nothing happen.
i have offset for all stats, you can change anything, also you can unlock all. I cant give them, I dont wanna ruin leaderboard with 2,147,483,648 score (maximum range for a 32 bit signed integer) and full prestige 20 in the game. If you really want it, search it, or wait until someone wanna ruin the game and release all offset