ELO calcul is?

Playing two conquerors in 2v2 while i’m plat ranked and lost 30 pts ?
Is there any logic in this ?
Why i’m continuing to give boost to top ladder ppl ?

If dev want more players in the base, it seems they need to fix that.
I’m not against to try to play challenging games but if i throw more pts than a regular game of my level, what’s the fun in this ?