EntropiaBones: The method to move from one tier to the next , is not based solely on these variables
The minimum number of rounds (at a specific level) and average (required to level up) is really only relevant to those players that play strictly ranked (or scored) rounds.
I believe it is common knowledge, at this point, for most players that have been playing since the "flash" days, that the criteria is different with coin room players or a player who plays both coin rooms and ranked rounds. As to the specific criteria as to these players, no one really knows.