I've often wondered whether the Q advantage offers a diminishing benefit the higher you climb the levels.
After all, a ten Q difference at Level 2 means one team will be roughly 50-75% stronger than their opponent. In your example (what's that, Level 12/13?) Sully, that advantage is down to approx. 12-15%.
Using 'real life' stats, that's similar to the difference between Man City and Arsenal (6-3) ... or Tottenham and Liverpool (0-5).
Purely speculative, obviously.