Trying to correct a terrible brillion seeding project. The people we contracted to perform this task is a reputable sod farm. The project was 2 baseball fields. When seeding was done the operator was seeding from 1st base to 3rd base in a semicircle gradually going further out each time but never went across like horizontal and vertical. When seed sprouted the gaps never filled in since they never went across to cover the gaps like a tic-tac-doe effect. Fields were seeded Oct 2006 and contractor never wanted to reseed. Fertilizing and Hydroseeding (without mulch)have decreased the spacing but a thick grass has never developed. Our last fertilizing was 2 weeks ago and we are waiting for results hopefully. Any thoughts other than overseeding with a slice seeder.