The system counts the AvQ based not in %, but the regular AvQ number that goes in steps of 5 by 5 per star. So the 1% can be -50% cause of this.
Then, as example, at level 1 the 5* is 20AvQ, level 2 25... 3=30 4=35 5=40
So at level 5 a 1% (or 0 stars +1% and lower rank that is ubcluded by the 1%) will be a 20AvQplayer +1%, and basically if you have, a 10AvQ player, in this case, which would be a -2* because the 0% is set at 20AvQ at level 45what the system will do is the average calculation of the best 14AvQs (this 10avq included) and, lets say you have +13 5*s and a 10AvQ player so 40x13 +10 = total best 14 avq and this is the number used to rank teams and create the leagues, in theory.