Assuming you always add ability increase to your highest stat. At 8th, the 'champions' that produce +9 total mods are:
15,15,12,12,12,10
16,13,12,12,12,12
15,14,12,12,12,12
15,13,13,13,12,12
8th level has the same champions as 1st, but they are +10.
11th level there are only two champions at...