The War Thunder psychology

I hope I am not aolone With this... but as soon as i activate a wager or a booster, my performance just simply drops under the mariana trench i was playing the cobra king, getting 5-6 kills per Battle, and after a Battle i realize that i have a Commander wager unactivated. well, its a cobra king, i play the best in this tank...what could go wrong. So i activate the wager. First Battle: about 20 Seconds Lifetime. quit Second Battle: about a minute Lifetime, getting an assist, then died. Third Battle: got one kill and we lost. Am i the only one, who just can't play With a booster or wager on? Its sooo infuriating...