When the team Heathmere of the South West DFL won more than 11 games, what is the maximum byes?
CREATE TABLE "2011_ladder" (
  "south_west_dfl" text,
  "wins" real,
  "byes" real,
  "losses" real,
  "draws" real,
  "against" real
);
SELECT MAX("byes") FROM "2011_ladder" WHERE "south_west_dfl"='heathmere' AND "wins">11;