Field sizes were a joke. Far, far too big. Way outside the standards.
It's not the responsibility of the field dimensions to keep your kids from bunching up.
For the record, Cal South specified State Cup field sizes for the U11's to be 60x90 (the maximum) size for this age group. The minimum size is 47x75 (which is also the maximum size for the U10 and U9's). Galway Downs, Silverlakes, SD Polo Fields, etc., etc., just paint the fields to the sizes specified by their customer ... Cal South.
The problem for a lot of teams at this age group is most "league" and "tournament" play is conducted on the 47x75 field size (min for U11 and max for U10/U9) because that field size does double duty.