I retake that last statement, it IS possible to get to 1900 rating, but it requires massive patience because you are queueing against 1680-1750 teams.Check the " Arena Stats " and you ll see how many teams were able to reach the required ratings .
Also it probably is possible to get from 1900-1950 rating aswell if you snipe 1800 teams when they sign in, but they will start queuedodgeing you as soon as you win more then once against them.
If you don't see my point now you're really trying to ignore it.
There are no teams above 1800 that queue regulairly so you won't get points on a steady basis, you will have to snipe teams in order to get your second/third part of brutal. Making it almost impossible to get the fourth or the fifth piece.