Especially jump height and gun damage need to be removed. In my opinion, if a player goes on a killstreak, it should not make it easier for them to keep it. Jump height makes it easy to get kills from advantageous positions, while the gun damage gives you a significant edge over everyone else.
While players should not be punished for going on a killstreak, it should not give them a free pass either. I further propose that xp bonuses from killstreaks should be applied after the game, so there is still an incentive to keep your streak going. Also remove the money bonus from it, it is just too much