As near to May 1 as possible move all hoops on all lawns one foot directly left (or right). This may be more or less than 12 inches but should be consistent in direction and length on all three lawns. String lawns from E to H and I to L to ensure that hoops are set squarely. See Setting A Lawn
As near to June 1 as possible move all hoops on all lawns directly two foot right (or left) but in the opposite direction to the May move. String lawns from E to H and I to L to ensure that hoops are set squarely.