Actually each point above 8 costs something off a little table, not so much 12 points to spread... typical spread is 27 points taken off the table I include down here.
ABILITY SCORE POINT COST
Score Cost Score Cost
8 - 0 12 - 4
9 - 1 13 - 5
10 - 2 14 - 7
11 - 3 15 - 9
By my calculations you got 0 + 9 + 2 + 4 + 4 + 9 = 28 meaning you're over budget by just one point.
ABILITY SCORE POINT COST
Score Cost Score Cost
8 - 0 12 - 4
9 - 1 13 - 5
10 - 2 14 - 7
11 - 3 15 - 9
By my calculations you got 0 + 9 + 2 + 4 + 4 + 9 = 28 meaning you're over budget by just one point.