Sacrificing EV because you cannot handle the variance sounds to me like you dont have a big enough bankroll.

If you sacrifice EV you are losing money but if you feel more comfortable playing that way then stick to it.

I can think of two valid reasons to sacrifice EV:
-your bankroll isnt big enough
-losing the hand is going to affect your play in future hands

Why would you rather play those hands in tournaments? In tournaments you should maximize your chances of winning the tournament not your +EV per hand (in the context of pot odds). If calling the bet is going to hurt your stack then you dont want to call with a 33% chance of winning the hand even though you have sufficient pot odds. 67% of the times you will lose that pot and with it cripple your stack and your odds of winning the tournament (and actually making a profit).

And why would you call one person and not two?